Patchwork [U-Boot,v14,07/10] arm64: core support

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Submitter fenghua@phytium.com.cn
Date Oct. 12, 2013, 8:14 a.m.
Message ID <1381565674-6855-8-git-send-email-fenghua@phytium.com.cn>
Download mbox | patch
Permalink /patch/282994/
State Superseded
Delegated to: Albert ARIBAUD
Headers show

Comments

fenghua@phytium.com.cn - Oct. 12, 2013, 8:14 a.m.
From: David Feng <fenghua@phytium.com.cn>

Relocation code based on a patch by Scott Wood, which is:
Signed-off-by: Scott Wood <scottwood@freescale.com>

Signed-off-by: David Feng <fenghua@phytium.com.cn>
---
 arch/arm/config.mk                      |    3 +-
 arch/arm/cpu/armv8/Makefile             |   38 +++++
 arch/arm/cpu/armv8/cache.S              |  130 +++++++++++++++++
 arch/arm/cpu/armv8/cache_v8.c           |  218 ++++++++++++++++++++++++++++
 arch/arm/cpu/armv8/config.mk            |   15 ++
 arch/arm/cpu/armv8/cpu.c                |   67 +++++++++
 arch/arm/cpu/armv8/exceptions.S         |  112 +++++++++++++++
 arch/arm/cpu/armv8/start.S              |  234 +++++++++++++++++++++++++++++++
 arch/arm/cpu/armv8/timer.c              |   80 +++++++++++
 arch/arm/cpu/armv8/tlb.S                |   30 ++++
 arch/arm/cpu/armv8/u-boot.lds           |   89 ++++++++++++
 arch/arm/include/asm/armv8/mmu.h        |  110 +++++++++++++++
 arch/arm/include/asm/byteorder.h        |   12 ++
 arch/arm/include/asm/cache.h            |    5 +
 arch/arm/include/asm/config.h           |    6 +
 arch/arm/include/asm/global_data.h      |    6 +-
 arch/arm/include/asm/io.h               |   15 +-
 arch/arm/include/asm/macro.h            |   36 +++++
 arch/arm/include/asm/posix_types.h      |   10 ++
 arch/arm/include/asm/proc-armv/ptrace.h |   21 +++
 arch/arm/include/asm/proc-armv/system.h |   59 +++++++-
 arch/arm/include/asm/system.h           |   77 ++++++++++
 arch/arm/include/asm/types.h            |    4 +
 arch/arm/include/asm/u-boot.h           |    4 +
 arch/arm/include/asm/unaligned.h        |    2 +-
 arch/arm/lib/Makefile                   |   14 ++
 arch/arm/lib/board.c                    |    7 +-
 arch/arm/lib/bootm.c                    |   16 +++
 arch/arm/lib/crt0_64.S                  |  113 +++++++++++++++
 arch/arm/lib/interrupts_64.c            |  120 ++++++++++++++++
 arch/arm/lib/relocate_64.S              |   58 ++++++++
 common/image.c                          |    1 +
 doc/README.arm64                        |   45 ++++++
 examples/standalone/stubs.c             |   15 ++
 include/image.h                         |    1 +
 35 files changed, 1762 insertions(+), 11 deletions(-)
 create mode 100644 arch/arm/cpu/armv8/Makefile
 create mode 100644 arch/arm/cpu/armv8/cache.S
 create mode 100644 arch/arm/cpu/armv8/cache_v8.c
 create mode 100644 arch/arm/cpu/armv8/config.mk
 create mode 100644 arch/arm/cpu/armv8/cpu.c
 create mode 100644 arch/arm/cpu/armv8/exceptions.S
 create mode 100644 arch/arm/cpu/armv8/start.S
 create mode 100644 arch/arm/cpu/armv8/timer.c
 create mode 100644 arch/arm/cpu/armv8/tlb.S
 create mode 100644 arch/arm/cpu/armv8/u-boot.lds
 create mode 100644 arch/arm/include/asm/armv8/mmu.h
 create mode 100644 arch/arm/lib/crt0_64.S
 create mode 100644 arch/arm/lib/interrupts_64.c
 create mode 100644 arch/arm/lib/relocate_64.S
 create mode 100644 doc/README.arm64

Patch

diff --git a/arch/arm/config.mk b/arch/arm/config.mk
index d0cf43f..a259193 100644
--- a/arch/arm/config.mk
+++ b/arch/arm/config.mk
@@ -17,7 +17,8 @@  endif
 
 LDFLAGS_FINAL += --gc-sections
 PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
-                     -fno-common -ffixed-r9 -msoft-float
+                     -fno-common -ffixed-r9
+PLATFORM_RELFLAGS += $(call cc-option, -msoft-float)
 
 # Support generic board on ARM
 __HAVE_ARCH_GENERIC_BOARD := y
diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile
new file mode 100644
index 0000000..b216f27
--- /dev/null
+++ b/arch/arm/cpu/armv8/Makefile
@@ -0,0 +1,38 @@ 
+#
+# (C) Copyright 2000-2003
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(CPU).o
+
+START	:= start.o
+
+COBJS	+= cpu.o
+COBJS	+= timer.o
+COBJS	+= cache_v8.o
+
+SOBJS	+= exceptions.o
+SOBJS	+= cache.o
+SOBJS	+= tlb.o
+
+SRCS	:= $(START:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
+START	:= $(addprefix $(obj),$(START))
+
+all:	$(obj).depend $(START) $(LIB)
+
+$(LIB):	$(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/arm/cpu/armv8/cache.S b/arch/arm/cpu/armv8/cache.S
new file mode 100644
index 0000000..419f169
--- /dev/null
+++ b/arch/arm/cpu/armv8/cache.S
@@ -0,0 +1,130 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <version.h>
+#include <asm/macro.h>
+#include <linux/linkage.h>
+
+/*
+ * void __asm_flush_dcache_level(level)
+ *
+ * clean and invalidate one level cache.
+ *
+ * x0: cache level
+ * x1~x9: clobbered
+ */
+ENTRY(__asm_flush_dcache_level)
+	lsl	x1, x0, #1
+	msr	csselr_el1, x1		/* select cache level */
+	isb				/* isb to sych the new cssr & csidr */
+	mrs	x6, ccsidr_el1		/* read the new ccsidr */
+	and	x2, x6, #7		/* x2 <- length of the cache lines */
+	add	x2, x2, #4		/* add 4 (line length offset) */
+	mov	x3, #0x3ff
+	and	x3, x3, x6, lsr #3	/* x3 <- maximum number of way size */
+	clz	w5, w3			/* bit position of way size */
+	mov	x4, #0x7fff
+	and	x4, x4, x1, lsr #13	/* x4 <- max number of the set size */
+	/* x1 <- cache level << 1 */
+	/* x2 <- line length offset */
+	/* x3 <- number of cache ways */
+	/* x4 <- number of cache sets */
+	/* x5 <- bit position of way size */
+
+loop_set:
+	mov	x6, x3			/* create working copy of way size */
+loop_way:
+	lsl	x7, x6, x5
+	orr	x9, x0, x7		/* map way and level to cisw value */
+	lsl	x7, x4, x2
+	orr	x9, x9, x7		/* map set number to cisw value */
+	dc	cisw, x9		/* clean & invalidate by set/way */
+	subs	x6, x6, #1		/* decrement the way */
+	b.ge	loop_way
+	subs	x4, x4, #1		/* decrement the set */
+	b.ge	loop_set
+
+	ret
+ENDPROC(__asm_flush_dcache_level)
+
+/*
+ * void __asm_flush_dcache_all(void)
+ *
+ * clean and invalidate all data cache by SET/WAY.
+ */
+ENTRY(__asm_flush_dcache_all)
+	dsb	sy
+	mov	x15, lr
+	mrs	x10, clidr_el1		/* read clidr */
+	lsr	x11, x10, #24
+	and	x11, x11, #0x7		/* x11 <- loc */
+	cbz	x11, finished		/* if loc is 0, no need to clean */
+	mov	x0, #0			/* start flush at cache level 0 */
+	/* x0  <- cache level */
+	/* x10 <- clidr_el1 */
+	/* x11 <- loc */
+
+loop_level:
+	lsl	x1, x0, #1
+	add	x1, x1, x0		/* x0 <- 3x cache level */
+	lsr	x1, x10, x1
+	and	x1, x1, #7		/* x1 <- cache type */
+	cmp	x1, #2
+	b.lt	skip			/* skip if no cache or icache */
+	bl	__asm_flush_dcache_level
+skip:
+	add	x0, x0, #1		/* increment cache level */
+	cmp	x11, x0
+	b.gt	loop_level
+
+finished:
+	mov	x0, #0
+	msr	csselr_el1, x0		/* swith back to cache level 0 */
+	dsb	sy
+	isb
+	mov	lr, x15
+	ret
+ENDPROC(__asm_flush_dcache_all)
+
+/*
+ * void __asm_flush_dcache_range(start, end)
+ *
+ * clean & invalidate data cache in the range
+ *
+ * x0: start address
+ * x1: end address
+ */
+ENTRY(__asm_flush_dcache_range)
+	mrs	x3, ctr_el0		/* read CTR */
+	lsr	x3, x3, #16
+	and	x3, x3, #0xf		/* cache line size encoding */
+	mov	x2, #4			/* bytes per word */
+	lsl	x2, x2, x3		/* actual cache line size */
+
+	/* x2 <- minimal cache line size in cache system */
+	sub	x3, x2, #1
+	bic	x0, x0, x3
+1:      dc	civac, x0		/* clean & invalidate D/unified line */
+	add	x0, x0, x2
+	cmp	x0, x1
+	b.lo	1b
+	dsb	sy
+	ret
+ENDPROC(__asm_flush_dcache_range)
+
+/*
+ * void __asm_invalidate_icache_all(void)
+ *
+ * invalidate all tlb entries.
+ */
+ENTRY(__asm_invalidate_icache_all)
+	ic	ialluis
+	isb	sy
+	ret
+ENDPROC(__asm_invalidate_icache_all)
diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
new file mode 100644
index 0000000..efd7466
--- /dev/null
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -0,0 +1,218 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/system.h>
+#include <asm/armv8/mmu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+
+static void set_pgtable_section(u64 section, u64 memory_type)
+{
+	u64 *page_table = (u64 *)gd->arch.tlb_addr;
+	u64 value;
+
+	value = (section << SECTION_SHIFT) | PMD_TYPE_SECT | PMD_SECT_AF;
+	value |= PMD_ATTRINDX(memory_type);
+	page_table[section] = value;
+}
+
+/* to activate the MMU we need to set up virtual memory */
+static void mmu_setup(void)
+{
+	int i, j, el;
+	bd_t *bd = gd->bd;
+
+	/* Setup an identity-mapping for all spaces */
+	for (i = 0; i < (PGTABLE_SIZE >> 3); i++)
+		set_pgtable_section(i, MT_DEVICE_NGNRNE);
+
+	/* Setup an identity-mapping for all RAM space */
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		ulong start = bd->bi_dram[i].start;
+		ulong end = bd->bi_dram[i].start + bd->bi_dram[i].size;
+		for (j = start >> SECTION_SHIFT;
+		     j < end >> SECTION_SHIFT; j++) {
+			set_pgtable_section(j, MT_NORMAL);
+		}
+	}
+
+	/* load TTBR0 */
+	el = curent_el();
+	if (el == 1)
+		asm volatile("msr ttbr0_el1, %0"
+			     : : "r" (gd->arch.tlb_addr) : "memory");
+	else if (el == 2)
+		asm volatile("msr ttbr0_el2, %0"
+			     : : "r" (gd->arch.tlb_addr) : "memory");
+	else
+		panic("Not Supported Exception Level");
+
+	/* enable the mmu */
+	set_sctlr(get_sctlr() | CR_M);
+}
+
+/*
+ * Performs a invalidation of the entire data cache at all levels
+ */
+void invalidate_dcache_all(void)
+{
+	__asm_flush_dcache_all();
+}
+
+/*
+ * Performs a clean & invalidation of the entire data cache at all levels
+ */
+void flush_dcache_all(void)
+{
+	__asm_flush_dcache_all();
+}
+
+/*
+ * Invalidates range in all levels of D-cache/unified cache
+ */
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+	__asm_flush_dcache_range(start, stop);
+}
+
+/*
+ * Flush range(clean & invalidate) from all levels of D-cache/unified cache
+ */
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+	__asm_flush_dcache_range(start, stop);
+}
+
+void dcache_enable(void)
+{
+	/* The data cache is not active unless the mmu is enabled */
+	if (!(get_sctlr() & CR_M)) {
+		invalidate_dcache_all();
+		__asm_invalidate_tlb_all();
+		mmu_setup();
+	}
+
+	set_sctlr(get_sctlr() | CR_C);
+}
+
+void dcache_disable(void)
+{
+	uint32_t sctlr;
+
+	sctlr = get_sctlr();
+
+	/* if cache isn't enabled no need to disable */
+	if (!(sctlr & CR_C))
+		return;
+
+	set_sctlr(sctlr & ~(CR_C|CR_M));
+
+	flush_dcache_all();
+	__asm_invalidate_tlb_all();
+}
+
+int dcache_status(void)
+{
+	return (get_sctlr() & CR_C) != 0;
+}
+
+#else	/* CONFIG_SYS_DCACHE_OFF */
+
+void invalidate_dcache_all(void)
+{
+}
+
+void flush_dcache_all(void)
+{
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+}
+
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+}
+
+void dcache_enable(void)
+{
+}
+
+void dcache_disable(void)
+{
+}
+
+int dcache_status(void)
+{
+	return 0;
+}
+
+#endif	/* CONFIG_SYS_DCACHE_OFF */
+
+#ifndef CONFIG_SYS_ICACHE_OFF
+
+void icache_enable(void)
+{
+	set_sctlr(get_sctlr() | CR_I);
+}
+
+void icache_disable(void)
+{
+	set_sctlr(get_sctlr() & ~CR_I);
+}
+
+int icache_status(void)
+{
+	return (get_sctlr() & CR_I) != 0;
+}
+
+void invalidate_icache_all(void)
+{
+	__asm_invalidate_icache_all();
+}
+
+#else	/* CONFIG_SYS_ICACHE_OFF */
+
+void icache_enable(void)
+{
+}
+
+void icache_disable(void)
+{
+}
+
+int icache_status(void)
+{
+	return 0;
+}
+
+void invalidate_icache_all(void)
+{
+}
+
+#endif	/* CONFIG_SYS_ICACHE_OFF */
+
+/*
+ * Enable dCache & iCache, whether cache is actually enabled
+ * depend on CONFIG_SYS_DCACHE_OFF and CONFIG_SYS_ICACHE_OFF
+ */
+void enable_caches(void)
+{
+	icache_enable();
+	dcache_enable();
+}
+
+/*
+ * Flush range from all levels of d-cache/unified-cache
+ */
+void flush_cache(unsigned long start, unsigned long size)
+{
+	flush_dcache_range(start, start + size);
+}
diff --git a/arch/arm/cpu/armv8/config.mk b/arch/arm/cpu/armv8/config.mk
new file mode 100644
index 0000000..027a68c
--- /dev/null
+++ b/arch/arm/cpu/armv8/config.mk
@@ -0,0 +1,15 @@ 
+#
+# (C) Copyright 2002
+# Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+PLATFORM_RELFLAGS += -fno-common -ffixed-x18
+
+# SEE README.arm-unaligned-accesses
+PF_NO_UNALIGNED := $(call cc-option, -mstrict-align)
+PLATFORM_NO_UNALIGNED := $(PF_NO_UNALIGNED)
+
+PF_CPPFLAGS_ARMV8 := $(call cc-option, -march=armv8-a)
+PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_ARMV8)
+PLATFORM_CPPFLAGS += $(PF_NO_UNALIGNED)
diff --git a/arch/arm/cpu/armv8/cpu.c b/arch/arm/cpu/armv8/cpu.c
new file mode 100644
index 0000000..83e73ab
--- /dev/null
+++ b/arch/arm/cpu/armv8/cpu.c
@@ -0,0 +1,67 @@ 
+/*
+ * (C) Copyright 2008 Texas Insturments
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/system.h>
+#include <linux/compiler.h>
+
+void __weak cpu_cache_initialization(void){}
+
+int cleanup_before_linux(void)
+{
+	/*
+	 * this function is called just before we call linux
+	 * it prepares the processor for linux
+	 *
+	 * we turn off caches etc ...
+	 */
+#ifndef CONFIG_SPL_BUILD
+	disable_interrupts();
+#endif
+
+	/*
+	 * Turn off I-cache and invalidate it
+	 */
+	icache_disable();
+	invalidate_icache_all();
+
+	/*
+	 * turn off D-cache
+	 * dcache_disable() in turn flushes the d-cache and disables MMU
+	 */
+	dcache_disable();
+
+	/*
+	 * After D-cache is flushed and before it is disabled there may
+	 * be some new valid entries brought into the cache. We are sure
+	 * that these lines are not dirty and will not affect our execution.
+	 * (because unwinding the call-stack and setting a bit in CP15 SCTRL
+	 * is all we did during this. We have not pushed anything on to the
+	 * stack. Neither have we affected any static data)
+	 * So just invalidate the entire d-cache again to avoid coherency
+	 * problems for kernel
+	 */
+	invalidate_dcache_all();
+
+	/*
+	 * Some CPU need more cache attention before starting the kernel.
+	 */
+	cpu_cache_initialization();
+
+	return 0;
+}
diff --git a/arch/arm/cpu/armv8/exceptions.S b/arch/arm/cpu/armv8/exceptions.S
new file mode 100644
index 0000000..b00d4b3
--- /dev/null
+++ b/arch/arm/cpu/armv8/exceptions.S
@@ -0,0 +1,112 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <version.h>
+#include <asm/ptrace.h>
+#include <asm/macro.h>
+#include <linux/linkage.h>
+
+/*
+ * Enter Exception.
+ * This will save the processor state that is ELR/X0~X30
+ * to the stack frame.
+ */
+.macro	exception_entry
+	stp	x29, x30, [sp, #-16]!
+	stp	x27, x28, [sp, #-16]!
+	stp	x25, x26, [sp, #-16]!
+	stp	x23, x24, [sp, #-16]!
+	stp	x21, x22, [sp, #-16]!
+	stp	x19, x20, [sp, #-16]!
+	stp	x17, x18, [sp, #-16]!
+	stp	x15, x16, [sp, #-16]!
+	stp	x13, x14, [sp, #-16]!
+	stp	x11, x12, [sp, #-16]!
+	stp	x9, x10, [sp, #-16]!
+	stp	x7, x8, [sp, #-16]!
+	stp	x5, x6, [sp, #-16]!
+	stp	x3, x4, [sp, #-16]!
+	stp	x1, x2, [sp, #-16]!
+
+	/* Could be running at EL1 or EL2 */
+	mrs	x11, CurrentEL
+	cmp	x11, 0x8
+	b.eq	1f
+	mrs	x1, esr_el1
+	mrs	x2, elr_el1
+	b	2f
+1:	mrs	x1, esr_el2
+	mrs	x2, elr_el2
+2:
+	stp	x2, x0, [sp, #-16]!
+	mov	x0, sp
+.endm
+
+/*
+ * Exception vectors.
+ */
+	.align	11
+	.globl	vectors
+vectors:
+	.align	7
+	b	_do_bad_sync	/* Current EL Synchronous Thread */
+
+	.align	7
+	b	_do_bad_irq	/* Current EL IRQ Thread */
+
+	.align	7
+	b	_do_bad_fiq	/* Current EL FIQ Thread */
+
+	.align	7
+	b	_do_bad_error	/* Current EL Error Thread */
+
+	.align	7
+	b	_do_sync	/* Current EL Synchronous Handler */
+
+	.align	7
+	b	_do_irq		/* Current EL IRQ Handler */
+
+	.align	7
+	b	_do_fiq		/* Current EL FIQ Handler */
+
+	.align	7
+	b	_do_error	/* Current EL Error Handler */
+
+
+_do_bad_sync:
+	exception_entry
+	bl	do_bad_sync
+
+_do_bad_irq:
+	exception_entry
+	bl	do_bad_irq
+
+_do_bad_fiq:
+	exception_entry
+	bl	do_bad_fiq
+
+_do_bad_error:
+	exception_entry
+	bl	do_bad_error
+
+_do_sync:
+	exception_entry
+	bl	do_sync
+
+_do_irq:
+	exception_entry
+	bl	do_irq
+
+_do_fiq:
+	exception_entry
+	bl	do_fiq
+
+_do_error:
+	exception_entry
+	bl	do_error
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
new file mode 100644
index 0000000..7352778
--- /dev/null
+++ b/arch/arm/cpu/armv8/start.S
@@ -0,0 +1,234 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <version.h>
+#include <linux/linkage.h>
+#include <asm/macro.h>
+#include <asm/armv8/mmu.h>
+
+/*************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ *************************************************************************/
+
+.globl	_start
+_start:
+	b	reset
+
+	.align 3
+
+.globl	_TEXT_BASE
+_TEXT_BASE:
+	.quad	CONFIG_SYS_TEXT_BASE
+
+/*
+ * These are defined in the linker script.
+ */
+.globl	_end_ofs
+_end_ofs:
+	.quad	_end - _start
+
+.globl	_bss_start_ofs
+_bss_start_ofs:
+	.quad	__bss_start - _start
+
+.globl	_bss_end_ofs
+_bss_end_ofs:
+	.quad	__bss_end - _start
+
+reset:
+	/*
+	 * Could be EL3/EL2/EL1
+	 */
+	mrs	x0, CurrentEL
+	cmp	x0, #0xc
+	b.ne	reset_nonsecure			/* Not EL3 */
+
+	bl	setup_el3			/* EL3 initialization */
+
+	/*
+	 * MMU Disabled, iCache Disabled, dCache Disabled
+	 */
+reset_nonsecure:
+
+#ifdef CONFIG_BOOTING_EL1
+	branch_if_el2 x0, 1f
+	b	2f
+1:	bl	setup_el2			/* EL2 initialization */
+2:
+#endif
+
+	/* Initialize vBAR/CPACR_EL1/MDSCR_EL1 */
+	adr	x0, vectors
+	branch_if_el2 x1, 1f
+	msr	vbar_el1, x0
+	mov	x0, #3 << 20
+	msr	cpacr_el1, x0			/* Enable FP/SIMD */
+	msr	mdscr_el1, xzr
+	b	2f
+1:	msr	vbar_el2, x0
+2:
+
+	/* Cache/BPB/TLB Invalidate */
+	bl	__asm_flush_dcache_all		/* dCache clean & invalidate */
+	bl	__asm_invalidate_icache_all	/* iCache invalidate */
+	bl	__asm_invalidate_tlb_all	/* invalidate TLBs */
+
+	/* Processor specific initialization */
+	bl	lowlevel_init
+
+	branch_if_slave	x0, slave_cpu
+
+	/*
+	 * Master CPU
+	 */
+master_cpu:
+	bl	_main
+
+	/*
+	 * Slave CPUs
+	 */
+slave_cpu:
+	wfe
+	ldr	x1, =CPU_RELEASE_ADDR
+	ldr	x0, [x1]
+	cbz	x0, slave_cpu
+	br	x0			/* branch to the given address */
+
+/*-------------------------------------------------------------------------*/
+
+WEAK(setup_el3)
+	mov	x0, #0x531	/* Non-secure EL0/EL1 | HVC | 64bit EL2 */
+	msr	scr_el3, x0
+	msr	cptr_el3, xzr	/* Disable coprocessor traps to EL3 */
+
+	/* GIC initialization */
+	branch_if_slave	x0, 2f
+
+	/* Master initialize distributor */
+	ldr	x1, =GICD_BASE		/* GICD_CTLR */
+	mov	w0, #0x3		/* Enable Group0 & Group1 */
+	str	w0, [x1]
+	ldr	w0, [x1, #0x4]		/* GICD_TYPER */
+	and	w2, w0, #0x1f		/* ITLinesNumber */
+	add	w2, w2, #0x1		/* Number of GICD_IGROUPR registers */
+	add	x1, x1, #0x80		/* GICD_IGROUPR */
+	mov	w0, #~0			/* All Group1 */
+1:	str	w0, [x1], #0x4
+	sub	w2, w2, #0x1
+	cbnz	w2, 1b
+	b	3f
+
+	/* Slave initialize distributor */
+2:	ldr	x1, =GICD_BASE		/* GICD_CTLR */
+	mov	w0, #~0			/* All Group1 */
+	str	w0, [x1, #0x80]
+
+	/* Initialize cpu interface */
+3:	ldr	x1, =GICC_BASE		/* GICC_CTLR */
+	mov	w0, #0x3		/* Enable Group0 & Group1 */
+	str	w0, [x1]
+
+	mov	w0, #0x1 << 7		/* Non-Secure access to GICC_PMR */
+	str	w0, [x1, #0x4]		/* GICC_PMR */
+
+	/* Counter frequency initialization */
+	ldr	x0, =CONFIG_SYS_CNTFRQ
+	msr	cntfrq_el0, x0
+
+	/* SCTLR_EL2 initialization */
+	msr	sctlr_el2, xzr
+
+	/* Return to the EL2_SP2 mode from EL3 */
+	mov	x0, #0x3c9		/* EL2_SP2 | D | A | I | F */
+	msr	elr_el3, lr
+	msr	spsr_el3, x0
+	eret
+ENDPROC(setup_el3)
+
+WEAK(setup_el2)
+	/* Initialize Generic Timers */
+	mrs	x0, cnthctl_el2
+	orr	x0, x0, #0x3		/* Enable EL1 access to timers */
+	msr	cnthctl_el2, x0
+	msr	cntvoff_el2, x0		/* Clear virtual offset */
+	mrs	x0, cntkctl_el1
+	orr	x0, x0, #0x3		/* EL0 access to counters */
+	msr	cntkctl_el1, x0
+
+	/* Initilize MPID/MPIDR registers */
+	mrs	x0, midr_el1
+	mrs	x1, mpidr_el1
+	msr	vpidr_el2, x0
+	msr	vmpidr_el2, x1
+
+	/* Disable coprocessor traps */
+	mov	x0, #0x33ff
+	msr	cptr_el2, x0		/* Disable coprocessor traps to EL2 */
+	msr	hstr_el2, xzr		/* Disable CP15 traps to EL2 */
+
+	/* Initialize HCR_EL2 */
+	mov	x0, #(1 << 31)		/* 64bit EL1 */
+	orr	x0, x0, #(1 << 29)	/* Disable HVC */
+	msr	hcr_el2, x0
+
+	/* SCTLR_EL1 initialization */
+	mov	x0, #0x0800
+	movk	x0, #0x30d0, lsl #16
+	msr	sctlr_el1, x0
+
+	/* Return to the EL1_SP1 mode from EL2 */
+	mov	x0, #0x3c5		/* EL1_SP1 | D | A | I | F */
+	msr	elr_el2, lr
+	msr	spsr_el2, x0
+	eret
+ENDPROC(setup_el2)
+
+WEAK(lowlevel_init)
+	ret
+ENDPROC(lowlevel_init)
+
+/*-------------------------------------------------------------------------*/
+
+ENTRY(c_runtime_cpu_setup)
+	/* If I-cache is enabled invalidate it */
+#ifndef CONFIG_SYS_ICACHE_OFF
+	ic	iallu			/* I+BTB cache invalidate */
+	isb	sy
+#endif
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+	/*
+	 * Setup MAIR and TCR.
+	 */
+	ldr	x0, =MEMORY_ATTRIBUTES
+	ldr	x1, =TCR_FLAGS
+
+	branch_if_el2 x2, 1f
+	orr	x1, x1, TCR_EL1_IPS_BITS
+	msr	mair_el1, x0
+	msr	tcr_el1, x1
+	b	2f
+1:	orr	x1, x1, TCR_EL2_IPS_BITS
+	msr	mair_el2, x0
+	msr	tcr_el2, x1
+2:
+#endif
+
+	/* Relocate vBAR */
+	adr	x0, vectors
+	branch_if_el2 x1, 1f
+	msr	vbar_el1, x0
+	b	2f
+1:	msr	vbar_el2, x0
+2:
+
+	ret
+ENDPROC(c_runtime_cpu_setup)
diff --git a/arch/arm/cpu/armv8/timer.c b/arch/arm/cpu/armv8/timer.c
new file mode 100644
index 0000000..9605e84
--- /dev/null
+++ b/arch/arm/cpu/armv8/timer.c
@@ -0,0 +1,80 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <div64.h>
+#include <linux/compiler.h>
+
+/*
+ * Genertic Timer implementation of __udelay/get_timer/get_ticks/get_tbclk
+ * functions. If any other timers used, another implementation should be
+ * placed in platform code.
+ */
+
+static inline u64 get_cntfrq(void)
+{
+	u64 cntfrq;
+	asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
+	return cntfrq;
+}
+
+static inline u64 tick_to_time(u64 tick)
+{
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, get_cntfrq());
+	return tick;
+}
+
+static inline u64 time_to_tick(u64 time)
+{
+	time *= get_cntfrq();
+	do_div(time, CONFIG_SYS_HZ);
+	return time;
+}
+
+/*
+ * Generic timer implementation of get_tbclk()
+ */
+ulong __weak get_tbclk(void)
+{
+	return CONFIG_SYS_HZ;
+}
+
+/*
+ * Generic timer implementation of get_timer()
+ */
+ulong __weak get_timer(ulong base)
+{
+	u64 cval;
+
+	isb();
+	asm volatile("mrs %0, cntpct_el0" : "=r" (cval));
+
+	return tick_to_time(cval) - base;
+}
+
+/*
+ * Generic timer implementation of get_ticks()
+ */
+unsigned long long __weak get_ticks(void)
+{
+	return get_timer(0);
+}
+
+/*
+ * Generic timer implementation of __udelay()
+ */
+void __weak __udelay(ulong usec)
+{
+	unsigned long ticks, limit;
+
+	limit = get_ticks() + usec/1000;
+
+	do {
+		ticks = get_ticks();
+	} while (ticks < limit);
+}
diff --git a/arch/arm/cpu/armv8/tlb.S b/arch/arm/cpu/armv8/tlb.S
new file mode 100644
index 0000000..4dd3a65
--- /dev/null
+++ b/arch/arm/cpu/armv8/tlb.S
@@ -0,0 +1,30 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <version.h>
+#include <linux/linkage.h>
+#include <asm/macro.h>
+
+/*
+ * void __asm_invalidate_tlb_all(void)
+ *
+ * invalidate all tlb entries.
+ */
+ENTRY(__asm_invalidate_tlb_all)
+	branch_if_el2 x9, 1f
+	tlbi	vmalle1
+	dsb	sy
+	isb
+	b	2f
+1:	tlbi	alle2
+	dsb	sy
+	isb
+2:
+	ret
+ENDPROC(__asm_invalidate_tlb_all)
diff --git a/arch/arm/cpu/armv8/u-boot.lds b/arch/arm/cpu/armv8/u-boot.lds
new file mode 100644
index 0000000..4c12222
--- /dev/null
+++ b/arch/arm/cpu/armv8/u-boot.lds
@@ -0,0 +1,89 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+OUTPUT_FORMAT("elf64-littleaarch64", "elf64-littleaarch64", "elf64-littleaarch64")
+OUTPUT_ARCH(aarch64)
+ENTRY(_start)
+SECTIONS
+{
+	. = 0x00000000;
+
+	. = ALIGN(8);
+	.text :
+	{
+		*(.__image_copy_start)
+		CPUDIR/start.o (.text*)
+		*(.text*)
+	}
+
+	. = ALIGN(8);
+	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
+
+	. = ALIGN(8);
+	.data : {
+		*(.data*)
+	}
+
+	. = ALIGN(8);
+
+	. = .;
+
+	. = ALIGN(8);
+	.u_boot_list : {
+		KEEP(*(SORT(.u_boot_list*)));
+	}
+
+	. = ALIGN(8);
+
+	.image_copy_end :
+	{
+		*(.__image_copy_end)
+	}
+
+	. = ALIGN(8);
+
+	.rel_dyn_start :
+	{
+		*(.__rel_dyn_start)
+	}
+
+	.rela.dyn : {
+		*(.rela*)
+	}
+
+	.rel_dyn_end :
+	{
+		*(.__rel_dyn_end)
+	}
+
+	_end = .;
+
+	. = ALIGN(8);
+
+	.bss_start : {
+		KEEP(*(.__bss_start));
+	}
+
+	.bss : {
+		*(.bss*)
+		 . = ALIGN(8);
+	}
+
+	.bss_end : {
+		KEEP(*(.__bss_end));
+	}
+
+	/DISCARD/ : { *(.dynsym) }
+	/DISCARD/ : { *(.dynstr*) }
+	/DISCARD/ : { *(.dynamic*) }
+	/DISCARD/ : { *(.plt*) }
+	/DISCARD/ : { *(.interp*) }
+	/DISCARD/ : { *(.gnu*) }
+}
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h
new file mode 100644
index 0000000..c131751
--- /dev/null
+++ b/arch/arm/include/asm/armv8/mmu.h
@@ -0,0 +1,110 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _ASM_ARMV8_MMU_H_
+#define _ASM_ARMV8_MMU_H_
+
+#ifdef __ASSEMBLY__
+#define _AC(X, Y)	X
+#else
+#define _AC(X, Y)	(X##Y)
+#endif
+
+#define UL(x)		_AC(x, UL)
+
+/***************************************************************/
+/*
+ * The following definitions are related each other, shoud be
+ * calculated specifically.
+ */
+#define VA_BITS			(42)	/* 42 bits virtual address */
+
+/* PAGE_SHIFT determines the page size */
+#undef  PAGE_SIZE
+#define PAGE_SHIFT		16
+#define PAGE_SIZE		(1 << PAGE_SHIFT)
+#define PAGE_MASK		(~(PAGE_SIZE-1))
+
+/*
+ * section address mask and size definitions.
+ */
+#define SECTION_SHIFT		29
+#define SECTION_SIZE		(UL(1) << SECTION_SHIFT)
+#define SECTION_MASK		(~(SECTION_SIZE-1))
+/***************************************************************/
+
+/*
+ * Memory types
+ */
+#define MT_DEVICE_NGNRNE	0
+#define MT_DEVICE_NGNRE		1
+#define MT_DEVICE_GRE		2
+#define MT_NORMAL_NC		3
+#define MT_NORMAL		4
+
+#define MEMORY_ATTRIBUTES	((0x00 << (MT_DEVICE_NGNRNE*8)) |	\
+				(0x04 << (MT_DEVICE_NGNRE*8)) |		\
+				(0x0c << (MT_DEVICE_GRE*8)) |		\
+				(0x44 << (MT_NORMAL_NC*8)) |		\
+				(UL(0xff) << (MT_NORMAL*8)))
+
+/*
+ * Hardware page table definitions.
+ *
+ * Level 2 descriptor (PMD).
+ */
+#define PMD_TYPE_MASK		(3 << 0)
+#define PMD_TYPE_FAULT		(0 << 0)
+#define PMD_TYPE_TABLE		(3 << 0)
+#define PMD_TYPE_SECT		(1 << 0)
+
+/*
+ * Section
+ */
+#define PMD_SECT_S		(3 << 8)
+#define PMD_SECT_AF		(1 << 10)
+#define PMD_SECT_NG		(1 << 11)
+#define PMD_SECT_PXN		(UL(1) << 53)
+#define PMD_SECT_UXN		(UL(1) << 54)
+
+/*
+ * AttrIndx[2:0]
+ */
+#define PMD_ATTRINDX(t)		((t) << 2)
+#define PMD_ATTRINDX_MASK	(7 << 2)
+
+/*
+ * TCR flags.
+ */
+#define TCR_T0SZ(x)		((64 - (x)) << 0)
+#define TCR_IRGN_NC		(0 << 8)
+#define TCR_IRGN_WBWA		(1 << 8)
+#define TCR_IRGN_WT		(2 << 8)
+#define TCR_IRGN_WBNWA		(3 << 8)
+#define TCR_IRGN_MASK		(3 << 8)
+#define TCR_ORGN_NC		(0 << 10)
+#define TCR_ORGN_WBWA		(1 << 10)
+#define TCR_ORGN_WT		(2 << 10)
+#define TCR_ORGN_WBNWA		(3 << 10)
+#define TCR_ORGN_MASK		(3 << 10)
+#define TCR_SHARED_NON		(0 << 12)
+#define TCR_SHARED_OUTER	(1 << 12)
+#define TCR_SHARED_INNER	(2 << 12)
+#define TCR_TG0_4K		(0 << 14)
+#define TCR_TG0_64K		(1 << 14)
+#define TCR_TG0_16K		(2 << 14)
+#define TCR_EL1_IPS_BITS	(UL(3) << 32)	/* 42 bits physical address */
+#define TCR_EL2_IPS_BITS	(3 << 16)	/* 42 bits physical address */
+
+/* PTWs cacheable, inner/outer WBWA and non-shareable */
+#define TCR_FLAGS		(TCR_TG0_64K |		\
+				TCR_SHARED_NON |	\
+				TCR_ORGN_WBWA |		\
+				TCR_IRGN_WBWA |		\
+				TCR_T0SZ(VA_BITS))
+
+#endif /* _ASM_ARMV8_MMU_H_ */
diff --git a/arch/arm/include/asm/byteorder.h b/arch/arm/include/asm/byteorder.h
index c3489f1..71a9966 100644
--- a/arch/arm/include/asm/byteorder.h
+++ b/arch/arm/include/asm/byteorder.h
@@ -23,10 +23,22 @@ 
 #  define __SWAB_64_THRU_32__
 #endif
 
+#ifdef	CONFIG_ARM64
+
+#ifdef __AARCH64EB__
+#include <linux/byteorder/big_endian.h>
+#else
+#include <linux/byteorder/little_endian.h>
+#endif
+
+#else	/* CONFIG_ARM64 */
+
 #ifdef __ARMEB__
 #include <linux/byteorder/big_endian.h>
 #else
 #include <linux/byteorder/little_endian.h>
 #endif
 
+#endif	/* CONFIG_ARM64 */
+
 #endif
diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h
index 6d60a4a..ddebbc8 100644
--- a/arch/arm/include/asm/cache.h
+++ b/arch/arm/include/asm/cache.h
@@ -11,6 +11,8 @@ 
 
 #include <asm/system.h>
 
+#ifndef CONFIG_ARM64
+
 /*
  * Invalidate L2 Cache using co-proc instruction
  */
@@ -28,6 +30,9 @@  void l2_cache_disable(void);
 void set_section_dcache(int section, enum dcache_option option);
 
 void dram_bank_mmu_setup(int bank);
+
+#endif
+
 /*
  * The current upper bound for ARM L1 data cache line sizes is 64 bytes.  We
  * use that value for aligning DMA buffers unless the board config has specified
diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
index 99b703e..abf79e5 100644
--- a/arch/arm/include/asm/config.h
+++ b/arch/arm/include/asm/config.h
@@ -9,4 +9,10 @@ 
 
 #define CONFIG_LMB
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH
+
+#ifdef CONFIG_ARM64
+#define CONFIG_PHYS_64BIT
+#define CONFIG_STATIC_RELA
+#endif
+
 #endif
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index e126436..60e8726 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -47,6 +47,10 @@  struct arch_global_data {
 
 #include <asm-generic/global_data.h>
 
-#define DECLARE_GLOBAL_DATA_PTR     register volatile gd_t *gd asm ("r9")
+#ifdef CONFIG_ARM64
+#define DECLARE_GLOBAL_DATA_PTR		register volatile gd_t *gd asm ("x18")
+#else
+#define DECLARE_GLOBAL_DATA_PTR		register volatile gd_t *gd asm ("r9")
+#endif
 
 #endif /* __ASM_GBL_DATA_H */
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 1fbc531..6a1f05a 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -75,42 +75,45 @@  static inline phys_addr_t virt_to_phys(void * vaddr)
 #define __arch_putw(v,a)		(*(volatile unsigned short *)(a) = (v))
 #define __arch_putl(v,a)		(*(volatile unsigned int *)(a) = (v))
 
-extern inline void __raw_writesb(unsigned int addr, const void *data, int bytelen)
+extern inline void __raw_writesb(unsigned long addr, const void *data,
+				 int bytelen)
 {
 	uint8_t *buf = (uint8_t *)data;
 	while(bytelen--)
 		__arch_putb(*buf++, addr);
 }
 
-extern inline void __raw_writesw(unsigned int addr, const void *data, int wordlen)
+extern inline void __raw_writesw(unsigned long addr, const void *data,
+				 int wordlen)
 {
 	uint16_t *buf = (uint16_t *)data;
 	while(wordlen--)
 		__arch_putw(*buf++, addr);
 }
 
-extern inline void __raw_writesl(unsigned int addr, const void *data, int longlen)
+extern inline void __raw_writesl(unsigned long addr, const void *data,
+				 int longlen)
 {
 	uint32_t *buf = (uint32_t *)data;
 	while(longlen--)
 		__arch_putl(*buf++, addr);
 }
 
-extern inline void __raw_readsb(unsigned int addr, void *data, int bytelen)
+extern inline void __raw_readsb(unsigned long addr, void *data, int bytelen)
 {
 	uint8_t *buf = (uint8_t *)data;
 	while(bytelen--)
 		*buf++ = __arch_getb(addr);
 }
 
-extern inline void __raw_readsw(unsigned int addr, void *data, int wordlen)
+extern inline void __raw_readsw(unsigned long addr, void *data, int wordlen)
 {
 	uint16_t *buf = (uint16_t *)data;
 	while(wordlen--)
 		*buf++ = __arch_getw(addr);
 }
 
-extern inline void __raw_readsl(unsigned int addr, void *data, int longlen)
+extern inline void __raw_readsl(unsigned long addr, void *data, int longlen)
 {
 	uint32_t *buf = (uint32_t *)data;
 	while(longlen--)
diff --git a/arch/arm/include/asm/macro.h b/arch/arm/include/asm/macro.h
index ff13f36..0977830 100644
--- a/arch/arm/include/asm/macro.h
+++ b/arch/arm/include/asm/macro.h
@@ -54,5 +54,41 @@ 
 	bcs	1b
 .endm
 
+#ifdef CONFIG_ARM64
+/*
+ * Register aliases.
+ */
+lr	.req	x30
+
+/*
+ * Branch according to exception level
+ */
+.macro	branch_if_el2, xreg, el2_label
+	mrs	\xreg, CurrentEL
+	cmp	\xreg, 0x8
+	b.eq	\el2_label
+.endm
+
+/*
+ * Branch if current processor is a slave,
+ * choose processor with all zero affinity value as the master.
+ */
+.macro	branch_if_slave, xreg, slave_label
+	mrs	\xreg, mpidr_el1
+	tst	\xreg, #0xff		/* Test Affinity 0 */
+	b.ne	\slave_label
+	lsr	\xreg, \xreg, #8
+	tst	\xreg, #0xff		/* Test Affinity 1 */
+	b.ne	\slave_label
+	lsr	\xreg, \xreg, #8
+	tst	\xreg, #0xff		/* Test Affinity 2 */
+	b.ne	\slave_label
+	lsr	\xreg, \xreg, #16
+	tst	\xreg, #0xff		/* Test Affinity 3 */
+	b.ne	\slave_label
+.endm
+
+#endif /* CONFIG_ARM64 */
+
 #endif /* __ASSEMBLY__ */
 #endif /* __ASM_ARM_MACRO_H__ */
diff --git a/arch/arm/include/asm/posix_types.h b/arch/arm/include/asm/posix_types.h
index c412486..9ba9add 100644
--- a/arch/arm/include/asm/posix_types.h
+++ b/arch/arm/include/asm/posix_types.h
@@ -13,6 +13,8 @@ 
 #ifndef __ARCH_ARM_POSIX_TYPES_H
 #define __ARCH_ARM_POSIX_TYPES_H
 
+#include <config.h>
+
 /*
  * This file is generally used by user-level software, so you need to
  * be a little careful about namespace pollution etc.  Also, we cannot
@@ -28,9 +30,17 @@  typedef int			__kernel_pid_t;
 typedef unsigned short		__kernel_ipc_pid_t;
 typedef unsigned short		__kernel_uid_t;
 typedef unsigned short		__kernel_gid_t;
+
+#ifdef	CONFIG_ARM64
+typedef unsigned long		__kernel_size_t;
+typedef long			__kernel_ssize_t;
+typedef long			__kernel_ptrdiff_t;
+#else	/* CONFIG_ARM64 */
 typedef unsigned int		__kernel_size_t;
 typedef int			__kernel_ssize_t;
 typedef int			__kernel_ptrdiff_t;
+#endif	/* CONFIG_ARM64 */
+
 typedef long			__kernel_time_t;
 typedef long			__kernel_suseconds_t;
 typedef long			__kernel_clock_t;
diff --git a/arch/arm/include/asm/proc-armv/ptrace.h b/arch/arm/include/asm/proc-armv/ptrace.h
index 79cc644..fd280cb 100644
--- a/arch/arm/include/asm/proc-armv/ptrace.h
+++ b/arch/arm/include/asm/proc-armv/ptrace.h
@@ -12,6 +12,25 @@ 
 
 #include <linux/config.h>
 
+#ifdef CONFIG_ARM64
+
+#define PCMASK		0
+
+#ifndef __ASSEMBLY__
+
+/*
+ * This struct defines the way the registers are stored
+ * on the stack during an exception.
+ */
+struct pt_regs {
+	unsigned long elr;
+	unsigned long regs[31];
+};
+
+#endif	/* __ASSEMBLY__ */
+
+#else	/* CONFIG_ARM64 */
+
 #define USR26_MODE	0x00
 #define FIQ26_MODE	0x01
 #define IRQ26_MODE	0x02
@@ -106,4 +125,6 @@  static inline int valid_user_regs(struct pt_regs *regs)
 
 #endif	/* __ASSEMBLY__ */
 
+#endif	/* CONFIG_ARM64 */
+
 #endif
diff --git a/arch/arm/include/asm/proc-armv/system.h b/arch/arm/include/asm/proc-armv/system.h
index b4cfa68..19b2b44 100644
--- a/arch/arm/include/asm/proc-armv/system.h
+++ b/arch/arm/include/asm/proc-armv/system.h
@@ -15,6 +15,60 @@ 
 /*
  * Save the current interrupt enable state & disable IRQs
  */
+#ifdef CONFIG_ARM64
+
+/*
+ * Save the current interrupt enable state
+ * and disable IRQs/FIQs
+ */
+#define local_irq_save(flags)					\
+	({							\
+	asm volatile(						\
+	"mrs	%0, daif"					\
+	"msr	daifset, #3"					\
+	: "=r" (flags)						\
+	:							\
+	: "memory");						\
+	})
+
+/*
+ * restore saved IRQ & FIQ state
+ */
+#define local_irq_restore(flags)				\
+	({							\
+	asm volatile(						\
+	"msr	daif, %0"					\
+	:							\
+	: "r" (flags)						\
+	: "memory");						\
+	})
+
+/*
+ * Enable IRQs/FIQs
+ */
+#define local_irq_enable()					\
+	({							\
+	asm volatile(						\
+	"msr	daifclr, #3"					\
+	:							\
+	:							\
+	: "memory");						\
+	})
+
+/*
+ * Disable IRQs/FIQs
+ */
+#define local_irq_disable()					\
+	({							\
+	asm volatile(						\
+	"msr	daifset, #3"					\
+	:							\
+	:							\
+	: "memory");						\
+	})
+
+#else	/* CONFIG_ARM64 */
+
 #define local_irq_save(x)					\
 	({							\
 		unsigned long temp;				\
@@ -109,7 +163,10 @@ 
 	: "r" (x)						\
 	: "memory")
 
-#if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
+#endif	/* CONFIG_ARM64 */
+
+#if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110) || \
+	defined(CONFIG_ARM64)
 /*
  * On the StrongARM, "swp" is terminally broken since it bypasses the
  * cache totally.  This means that the cache becomes inconsistent, and,
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 760345f..0e7c455 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -1,6 +1,79 @@ 
 #ifndef __ASM_ARM_SYSTEM_H
 #define __ASM_ARM_SYSTEM_H
 
+#ifdef CONFIG_ARM64
+
+/*
+ * SCTLR_EL1/SCTLR_EL2 bits definitions
+ */
+#define CR_M		(1 << 0)	/* MMU enable			*/
+#define CR_A		(1 << 1)	/* Alignment abort enable	*/
+#define CR_C		(1 << 2)	/* Dcache enable		*/
+#define CR_SA		(1 << 3)	/* Stack Alignment Check Enable	*/
+#define CR_I		(1 << 12)	/* Icache enable		*/
+#define CR_WXN		(1 << 19)	/* Write Permision Imply XN	*/
+#define CR_EE		(1 << 25)	/* Exception (Big) Endian	*/
+
+#define PGTABLE_SIZE	(0x10000)
+
+#ifndef __ASSEMBLY__
+
+#define isb()				\
+	({asm volatile(			\
+	"isb" : : : "memory");		\
+	})
+
+#define wfi()				\
+	({asm volatile(			\
+	"wfi" : : : "memory");		\
+	})
+
+static inline unsigned int curent_el(void)
+{
+	unsigned int el;
+	asm volatile("mrs %0, CurrentEL" : "=r" (el) : : "cc");
+	return el >> 2;
+}
+
+static inline unsigned int get_sctlr(void)
+{
+	unsigned int el, val;
+
+	el = curent_el();
+	if (el == 1)
+		asm volatile("mrs %0, sctlr_el1" : "=r" (val) : : "cc");
+	else if (el == 2)
+		asm volatile("mrs %0, sctlr_el2" : "=r" (val) : : "cc");
+	else
+		panic("Not Supported Exception Level");
+
+	return val;
+}
+
+static inline void set_sctlr(unsigned int val)
+{
+	unsigned int el;
+
+	el = curent_el();
+	if (el == 1)
+		asm volatile("msr sctlr_el1, %0" : : "r" (val) : "cc");
+	else if (el == 2)
+		asm volatile("msr sctlr_el2, %0" : : "r" (val) : "cc");
+	else
+		panic("Not Supported Exception Level");
+
+	asm volatile("isb");
+}
+
+void __asm_flush_dcache_all(void);
+void __asm_flush_dcache_range(u64 start, u64 end);
+void __asm_invalidate_tlb_all(void);
+void __asm_invalidate_icache_all(void);
+
+#endif	/* __ASSEMBLY__ */
+
+#else /* CONFIG_ARM64 */
+
 #ifdef __KERNEL__
 
 #define CPU_ARCH_UNKNOWN	0
@@ -45,6 +118,8 @@ 
 #define CR_AFE	(1 << 29)	/* Access flag enable			*/
 #define CR_TE	(1 << 30)	/* Thumb exception enable		*/
 
+#define PGTABLE_SIZE		(4096 * 4)
+
 /*
  * This is used to ensure the compiler did actually allocate the register we
  * asked it for some inline assembly sequences.  Apparently we can't trust
@@ -132,4 +207,6 @@  void mmu_page_table_flush(unsigned long start, unsigned long stop);
 
 #endif /* __KERNEL__ */
 
+#endif /* CONFIG_ARM64 */
+
 #endif
diff --git a/arch/arm/include/asm/types.h b/arch/arm/include/asm/types.h
index 71dc049..2326420 100644
--- a/arch/arm/include/asm/types.h
+++ b/arch/arm/include/asm/types.h
@@ -39,7 +39,11 @@  typedef unsigned int u32;
 typedef signed long long s64;
 typedef unsigned long long u64;
 
+#ifdef	CONFIG_ARM64
+#define BITS_PER_LONG 64
+#else	/* CONFIG_ARM64 */
 #define BITS_PER_LONG 32
+#endif	/* CONFIG_ARM64 */
 
 /* Dma addresses are 32-bits wide.  */
 
diff --git a/arch/arm/include/asm/u-boot.h b/arch/arm/include/asm/u-boot.h
index 2b5fce8..cb81232 100644
--- a/arch/arm/include/asm/u-boot.h
+++ b/arch/arm/include/asm/u-boot.h
@@ -44,6 +44,10 @@  typedef struct bd_info {
 #endif /* !CONFIG_SYS_GENERIC_BOARD */
 
 /* For image.h:image_check_target_arch() */
+#ifndef CONFIG_ARM64
 #define IH_ARCH_DEFAULT IH_ARCH_ARM
+#else
+#define IH_ARCH_DEFAULT IH_ARCH_ARM64
+#endif
 
 #endif	/* _U_BOOT_H_ */
diff --git a/arch/arm/include/asm/unaligned.h b/arch/arm/include/asm/unaligned.h
index 44593a8..0a228fb 100644
--- a/arch/arm/include/asm/unaligned.h
+++ b/arch/arm/include/asm/unaligned.h
@@ -8,7 +8,7 @@ 
 /*
  * Select endianness
  */
-#ifndef __ARMEB__
+#if __BYTE_ORDER == __LITTLE_ENDIAN
 #define get_unaligned	__get_unaligned_le
 #define put_unaligned	__put_unaligned_le
 #else
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 4e78723..03c31c7 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -10,6 +10,9 @@  include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(ARCH).o
 LIBGCC	= $(obj)libgcc.o
 
+ifdef CONFIG_ARM64
+SOBJS-y += crt0_64.o
+else
 GLSOBJS	+= _ashldi3.o
 GLSOBJS	+= _ashrdi3.o
 GLSOBJS	+= _divsi3.o
@@ -21,9 +24,14 @@  GLSOBJS	+= _umodsi3.o
 GLCOBJS	+= div0.o
 
 SOBJS-y += crt0.o
+endif
 
 ifndef CONFIG_SPL_BUILD
+ifdef CONFIG_ARM64
+SOBJS-y += relocate_64.o
+else
 SOBJS-y += relocate.o
+endif
 ifndef CONFIG_SYS_GENERIC_BOARD
 COBJS-y	+= board.o
 endif
@@ -38,11 +46,17 @@  else
 COBJS-$(CONFIG_SPL_FRAMEWORK) += spl.o
 endif
 
+ifdef CONFIG_ARM64
+COBJS-y	+= interrupts_64.o
+else
 COBJS-y	+= interrupts.o
+endif
 COBJS-y	+= reset.o
 
 COBJS-y	+= cache.o
+ifndef CONFIG_ARM64
 COBJS-y	+= cache-cp15.o
+endif
 
 SRCS	:= $(GLSOBJS:.o=.S) $(GLCOBJS:.o=.c) \
 	   $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 34f50b0..c4904b4 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -344,7 +344,7 @@  void board_init_f(ulong bootflag)
 
 #if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
 	/* reserve TLB table */
-	gd->arch.tlb_size = 4096 * 4;
+	gd->arch.tlb_size = PGTABLE_SIZE;
 	addr -= gd->arch.tlb_size;
 
 	/* round down to next 64 kB limit */
@@ -419,6 +419,7 @@  void board_init_f(ulong bootflag)
 	}
 #endif
 
+#ifndef CONFIG_ARM64
 	/* setup stackpointer for exeptions */
 	gd->irq_sp = addr_sp;
 #ifdef CONFIG_USE_IRQ
@@ -431,6 +432,10 @@  void board_init_f(ulong bootflag)
 
 	/* 8-byte alignment for ABI compliance */
 	addr_sp &= ~0x07;
+#else	/* CONFIG_ARM64 */
+	/* 16-byte alignment for ABI compliance */
+	addr_sp &= ~0x0f;
+#endif	/* CONFIG_ARM64 */
 #else
 	addr_sp += 128;	/* leave 32 words for abort-stack   */
 	gd->irq_sp = addr_sp;
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index f476a89..b372d99 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -240,6 +240,21 @@  static void boot_prep_linux(bootm_headers_t *images)
 /* Subcommand: GO */
 static void boot_jump_linux(bootm_headers_t *images, int flag)
 {
+#ifdef CONFIG_ARM64
+	void (*kernel_entry)(void *fdt_addr);
+	int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
+
+	kernel_entry = (void (*)(void *fdt_addr))images->ep;
+
+	debug("## Transferring control to Linux (at address %lx)...\n",
+		(ulong) kernel_entry);
+	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
+
+	announce_and_cleanup(fake);
+
+	if (!fake)
+		kernel_entry(images->ft_addr);
+#else
 	unsigned long machid = gd->bd->bi_arch_number;
 	char *s;
 	void (*kernel_entry)(int zero, int arch, uint params);
@@ -266,6 +281,7 @@  static void boot_jump_linux(bootm_headers_t *images, int flag)
 
 	if (!fake)
 		kernel_entry(0, machid, r2);
+#endif
 }
 
 /* Main Entry point for arm bootm implementation
diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S
new file mode 100644
index 0000000..7756396
--- /dev/null
+++ b/arch/arm/lib/crt0_64.S
@@ -0,0 +1,113 @@ 
+/*
+ * crt0 - C-runtime startup Code for AArch64 U-Boot
+ *
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * (C) Copyright 2012
+ * Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm-offsets.h>
+#include <asm/macro.h>
+#include <linux/linkage.h>
+
+/*
+ * This file handles the target-independent stages of the U-Boot
+ * start-up where a C runtime environment is needed. Its entry point
+ * is _main and is branched into from the target's start.S file.
+ *
+ * _main execution sequence is:
+ *
+ * 1. Set up initial environment for calling board_init_f().
+ *    This environment only provides a stack and a place to store
+ *    the GD ('global data') structure, both located in some readily
+ *    available RAM (SRAM, locked cache...). In this context, VARIABLE
+ *    global data, initialized or not (BSS), are UNAVAILABLE; only
+ *    CONSTANT initialized data are available.
+ *
+ * 2. Call board_init_f(). This function prepares the hardware for
+ *    execution from system RAM (DRAM, DDR...) As system RAM may not
+ *    be available yet, , board_init_f() must use the current GD to
+ *    store any data which must be passed on to later stages. These
+ *    data include the relocation destination, the future stack, and
+ *    the future GD location.
+ *
+ * (the following applies only to non-SPL builds)
+ *
+ * 3. Set up intermediate environment where the stack and GD are the
+ *    ones allocated by board_init_f() in system RAM, but BSS and
+ *    initialized non-const data are still not available.
+ *
+ * 4. Call relocate_code(). This function relocates U-Boot from its
+ *    current location into the relocation destination computed by
+ *    board_init_f().
+ *
+ * 5. Set up final environment for calling board_init_r(). This
+ *    environment has BSS (initialized to 0), initialized non-const
+ *    data (initialized to their intended value), and stack in system
+ *    RAM. GD has retained values set by board_init_f(). Some CPUs
+ *    have some work left to do at this point regarding memory, so
+ *    call c_runtime_cpu_setup.
+ *
+ * 6. Branch to board_init_r().
+ */
+
+ENTRY(_main)
+
+/*
+ * Set up initial C runtime environment and call board_init_f(0).
+ */
+	ldr	x0, =(CONFIG_SYS_INIT_SP_ADDR)
+	sub	x0, x0, #GD_SIZE	/* allocate one GD above SP */
+	bic	sp, x0, #0xf	/* 16-byte alignment for ABI compliance */
+	mov	x18, sp			/* GD is above SP */
+	mov	x0, #0
+	bl	board_init_f
+
+/*
+ * Set up intermediate environment (new sp and gd) and call
+ * relocate_code(addr_moni). Trick here is that we'll return
+ * 'here' but relocated.
+ */
+	ldr	x0, [x18, #GD_START_ADDR_SP]	/* x0 <- gd->start_addr_sp */
+	bic	sp, x0, #0xf	/* 16-byte alignment for ABI compliance */
+	ldr	x18, [x18, #GD_BD]		/* x18 <- gd->bd */
+	sub	x18, x18, #GD_SIZE		/* new GD is below bd */
+
+	adr	lr, relocation_return
+	ldr	x9, [x18, #GD_RELOC_OFF]	/* x9 <- gd->reloc_off */
+	add	lr, lr, x9	/* new return address after relocation */
+	ldr	x0, [x18, #GD_RELOCADDR]	/* x0 <- gd->relocaddr */
+	b	relocate_code
+
+relocation_return:
+
+/*
+ * Set up final (full) environment
+ */
+	bl	c_runtime_cpu_setup		/* still call old routine */
+
+/*
+ * Clear BSS section
+ */
+	ldr	x0, =__bss_start		/* this is auto-relocated! */
+	ldr	x1, =__bss_end			/* this is auto-relocated! */
+	mov	x2, #0
+clear_loop:
+	str	x2, [x0]
+	add	x0, x0, #8
+	cmp	x0, x1
+	b.lo	clear_loop
+
+	/* call board_init_r(gd_t *id, ulong dest_addr) */
+	mov	x0, x18				/* gd_t */
+	ldr	x1, [x18, #GD_RELOCADDR]	/* dest_addr */
+	b	board_init_r			/* PC relative jump */
+
+	/* NOTREACHED - board_init_r() does not return */
+
+ENDPROC(_main)
diff --git a/arch/arm/lib/interrupts_64.c b/arch/arm/lib/interrupts_64.c
new file mode 100644
index 0000000..b476722
--- /dev/null
+++ b/arch/arm/lib/interrupts_64.c
@@ -0,0 +1,120 @@ 
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/compiler.h>
+
+
+int interrupt_init(void)
+{
+	return 0;
+}
+
+void enable_interrupts(void)
+{
+	return;
+}
+
+int disable_interrupts(void)
+{
+	return 0;
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	int i;
+
+	printf("ELR:     %lx\n", regs->elr);
+	printf("LR:      %lx\n", regs->regs[30]);
+	for (i = 0; i < 29; i += 2)
+		printf("x%-2d: %016lx x%-2d: %016lx\n",
+		       i, regs->regs[i], i+1, regs->regs[i+1]);
+	printf("\n");
+}
+
+/*
+ * do_bad_sync handles the impossible case in the Synchronous Abort vector.
+ */
+void do_bad_sync(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("Bad mode in \"Synchronous Abort\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_bad_irq handles the impossible case in the Irq vector.
+ */
+void do_bad_irq(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("Bad mode in \"Irq\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_bad_fiq handles the impossible case in the Fiq vector.
+ */
+void do_bad_fiq(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("Bad mode in \"Fiq\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_bad_error handles the impossible case in the Error vector.
+ */
+void do_bad_error(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("Bad mode in \"Error\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_sync handles the Synchronous Abort exception.
+ */
+void do_sync(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("\"Synchronous Abort\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_irq handles the Irq exception.
+ */
+void do_irq(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("\"Irq\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_fiq handles the Fiq exception.
+ */
+void do_fiq(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("\"Fiq\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
+
+/*
+ * do_error handles the Error exception.
+ * Errors are more likely to be processor specific,
+ * it is defined with weak attribute and can be redefined
+ * in processor specific code.
+ */
+void __weak do_error(struct pt_regs *pt_regs, unsigned int esr)
+{
+	printf("\"Error\" handler, esr 0x%08x\n", esr);
+	show_regs(pt_regs);
+	panic("Resetting CPU ...\n");
+}
diff --git a/arch/arm/lib/relocate_64.S b/arch/arm/lib/relocate_64.S
new file mode 100644
index 0000000..7fba9e2
--- /dev/null
+++ b/arch/arm/lib/relocate_64.S
@@ -0,0 +1,58 @@ 
+/*
+ * relocate - common relocation function for AArch64 U-Boot
+ *
+ * (C) Copyright 2013
+ * Albert ARIBAUD <albert.u.boot@aribaud.net>
+ * David Feng <fenghua@phytium.com.cn>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+
+/*
+ * void relocate_code (addr_moni)
+ *
+ * This function relocates the monitor code.
+ * x0 holds the destination address.
+ */
+ENTRY(relocate_code)
+	/*
+	 * Copy u-boot from flash to RAM
+	 */
+	ldr	x1, =__image_copy_start	/* x1 <- SRC &__image_copy_start */
+	subs	x9, x0, x1		/* x9 <- relocation offset */
+	b.eq	relocate_done		/* skip relocation */
+	ldr	x2, =__image_copy_end	/* x2 <- SRC &__image_copy_end */
+
+copy_loop:
+	ldp	x10, x11, [x1], #16	/* copy from source address [x1] */
+	stp	x10, x11, [x0], #16	/* copy to   target address [x0] */
+	cmp	x1, x2			/* until source end address [x2] */
+	b.lo	copy_loop
+
+	/*
+	 * Fix .rela.dyn relocations
+	 */
+	ldr	x2, =__rel_dyn_start	/* x2 <- SRC &__rel_dyn_start */
+	ldr	x3, =__rel_dyn_end	/* x3 <- SRC &__rel_dyn_end */
+fixloop:
+	ldp	x0, x1, [x2], #16	/* (x0,x1) <- (SRC location, fixup) */
+	ldr	x4, [x2], #8		/* x4 <- addend */
+	and	x1, x1, #0xffffffff
+	cmp	x1, #1027		/* relative fixup? */
+	bne	fixnext
+
+	/* relative fix: store addend plus offset at dest location */
+	add	x0, x0, x9
+	add	x4, x4, x9
+	str	x4, [x0]
+fixnext:
+	cmp	x2, x3
+	b.lo	fixloop
+
+relocate_done:
+	ret
+ENDPROC(relocate_code)
diff --git a/common/image.c b/common/image.c
index b0ae58f..4145354 100644
--- a/common/image.c
+++ b/common/image.c
@@ -81,6 +81,7 @@  static const table_entry_t uimage_arch[] = {
 	{	IH_ARCH_NDS32,		"nds32",	"NDS32",	},
 	{	IH_ARCH_OPENRISC,	"or1k",		"OpenRISC 1000",},
 	{	IH_ARCH_SANDBOX,	"sandbox",	"Sandbox",	},
+	{	IH_ARCH_ARM64,		"arm64",	"AArch64",	},
 	{	-1,			"",		"",		},
 };
 
diff --git a/doc/README.arm64 b/doc/README.arm64
new file mode 100644
index 0000000..b7800cb
--- /dev/null
+++ b/doc/README.arm64
@@ -0,0 +1,45 @@ 
+U-boot for arm64
+
+Summary
+=======
+No hardware platform of arm64 is available now. The u-boot is
+simulated on Foundation Model and Fast Model for ARMv8.
+
+Notes
+=====
+
+1. Currenly, u-boot could be running at EL1 or EL2.
+
+2. U-boot for arm64 is compiled with AArch64-gcc. AArch64-gcc
+   use rela relocation format, a tool(tools/relocate-rela) by Scott Wood
+   is used to encode the initial addend of rela to u-boot.bin. After running,
+   the u-boot will be relocated to destination again.
+
+3. Fdt should be placed at a 2-megabyte boundary and within the first 512
+   megabytes from the start of the kernel image. So, fdt_high should be
+   defined specially.
+   Please reference linux/Documentation/arm64/booting.txt for detail.
+
+4. Spin-table is used to wake up secondary processors. One location
+   (or per processor location) is defined to hold the kernel entry point
+   for secondary processors. It must be ensured that the location is
+   accessible and zero immediately after secondary processor
+   enter slave_cpu branch execution in start.S. The location address
+   is encoded in cpu node of DTS. Linux kernel store the entry point
+   of secondary processors to it and send event to wakeup secondary
+   processors.
+   Please reference linux/Documentation/arm64/booting.txt for detail.
+
+5. Generic board is supported.
+
+6. CONFIG_ARM64 instead of CONFIG_ARMV8 is used to distinguish aarch64 and
+   aarch32 specific codes.
+
+Contributor
+===========
+   Tom Rini       <trini@ti.com>
+   Scott Wood     <scottwood@freescale.com>
+   York Sun       <yorksun@freescale.com>
+   Simon Glass    <sjg@chromium.org>
+   Sharma Bhupesh <bhupesh.sharma@freescale.com>
+   Rob Herring    <robherring2@gmail.com>
diff --git a/examples/standalone/stubs.c b/examples/standalone/stubs.c
index 8fb1765..fc5d7ef 100644
--- a/examples/standalone/stubs.c
+++ b/examples/standalone/stubs.c
@@ -39,6 +39,20 @@  gd_t *global_data;
 "	bctr\n"				\
 	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r11");
 #elif defined(CONFIG_ARM)
+#ifdef CONFIG_ARM64
+/*
+ * x18 holds the pointer to the global_data, x9 is a call-clobbered
+ * register
+ */
+#define EXPORT_FUNC(x) \
+	asm volatile (			\
+"	.globl " #x "\n"		\
+#x ":\n"				\
+"	ldr	x9, [x18, %0]\n"		\
+"	ldr	x9, [x9, %1]\n"		\
+"	br	x9\n"		\
+	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "x9");
+#else
 /*
  * r8 holds the pointer to the global_data, ip is a call-clobbered
  * register
@@ -50,6 +64,7 @@  gd_t *global_data;
 "	ldr	ip, [r8, %0]\n"		\
 "	ldr	pc, [ip, %1]\n"		\
 	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
+#endif
 #elif defined(CONFIG_MIPS)
 /*
  * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
diff --git a/include/image.h b/include/image.h
index ee6eb8d..7de2bb2 100644
--- a/include/image.h
+++ b/include/image.h
@@ -156,6 +156,7 @@  struct lmb;
 #define IH_ARCH_SANDBOX		19	/* Sandbox architecture (test only) */
 #define IH_ARCH_NDS32	        20	/* ANDES Technology - NDS32  */
 #define IH_ARCH_OPENRISC        21	/* OpenRISC 1000  */
+#define IH_ARCH_ARM64		22	/* ARM64	*/
 
 /*
  * Image Types