Patchwork [U-Boot,v4,03/15] sandbox: Switch over to generic board

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Submitter Simon Glass
Date April 26, 2013, 12:53 p.m.
Message ID <1366980835-17497-4-git-send-email-sjg@chromium.org>
Download mbox | patch
Permalink /patch/239859/
State Accepted, archived
Delegated to: Simon Glass
Headers show

Comments

Simon Glass - April 26, 2013, 12:53 p.m.
Add generic board support for sandbox. and remove the old board init code.

Select CONFIG_SYS_GENERIC_BOARD for sandbox now that this is supported.

Signed-off-by: Simon Glass <sjg@chromium.org>
---
Changes in v4:
- Squash three generic board commits into one

Changes in v3: None
Changes in v2: None

 arch/sandbox/config.mk            |   5 +-
 arch/sandbox/include/asm/io.h     |   5 +
 arch/sandbox/include/asm/u-boot.h |  22 +--
 arch/sandbox/lib/Makefile         |   1 -
 arch/sandbox/lib/board.c          | 285 --------------------------------------
 board/sandbox/sandbox/sandbox.c   |   2 +-
 common/board_f.c                  |  51 +++++--
 common/board_r.c                  |   8 +-
 include/asm-generic/sections.h    |   2 +-
 include/configs/sandbox.h         |   7 +-
 lib/fdtdec.c                      |   2 +-
 11 files changed, 66 insertions(+), 324 deletions(-)
 delete mode 100644 arch/sandbox/lib/board.c
Tom Rini - April 30, 2013, 8:46 p.m.
On Fri, Apr 26, 2013 at 05:53:43AM -0700, Simon Glass wrote:

> Add generic board support for sandbox. and remove the old board init code.
> 
> Select CONFIG_SYS_GENERIC_BOARD for sandbox now that this is supported.
> 
> Signed-off-by: Simon Glass <sjg@chromium.org>

Reviewed-by: Tom Rini <trini@ti.com>

Patch

diff --git a/arch/sandbox/config.mk b/arch/sandbox/config.mk
index 4fd0d4e..988b52c 100644
--- a/arch/sandbox/config.mk
+++ b/arch/sandbox/config.mk
@@ -18,5 +18,8 @@ 
 # MA 02111-1307 USA
 
 PLATFORM_CPPFLAGS += -DCONFIG_SANDBOX -D__SANDBOX__ -U_FORTIFY_SOURCE
-PLATFORM_CPPFLAGS += -DCONFIG_ARCH_MAP_SYSMEM
+PLATFORM_CPPFLAGS += -DCONFIG_ARCH_MAP_SYSMEM -DCONFIG_SYS_GENERIC_BOARD
 PLATFORM_LIBS += -lrt
+
+# Support generic board on sandbox
+__HAVE_ARCH_GENERIC_BOARD := y
diff --git a/arch/sandbox/include/asm/io.h b/arch/sandbox/include/asm/io.h
index 54051a3..0c022f1 100644
--- a/arch/sandbox/include/asm/io.h
+++ b/arch/sandbox/include/asm/io.h
@@ -20,6 +20,9 @@ 
  * MA 02111-1307 USA
  */
 
+#ifndef __SANDBOX_ASM_IO_H
+#define __SANDBOX_ASM_IO_H
+
 /*
  * Given a physical address and a length, return a virtual address
  * that can be used to access the memory range with the caching
@@ -52,3 +55,5 @@  static inline void unmap_sysmem(const void *vaddr)
 
 /* Map from a pointer to our RAM buffer */
 phys_addr_t map_to_sysmem(void *ptr);
+
+#endif
diff --git a/arch/sandbox/include/asm/u-boot.h b/arch/sandbox/include/asm/u-boot.h
index de8120a..5bea1f2 100644
--- a/arch/sandbox/include/asm/u-boot.h
+++ b/arch/sandbox/include/asm/u-boot.h
@@ -36,26 +36,8 @@ 
 #ifndef _U_BOOT_H_
 #define _U_BOOT_H_	1
 
-typedef struct bd_info {
-	unsigned long	bi_memstart;	/* start of DRAM memory */
-	phys_size_t	bi_memsize;	/* size	 of DRAM memory in bytes */
-	unsigned long	bi_flashstart;	/* start of FLASH memory */
-	unsigned long	bi_flashsize;	/* size	 of FLASH memory */
-	unsigned long	bi_flashoffset; /* reserved area for startup monitor */
-	unsigned long	bi_sramstart;	/* start of SRAM memory */
-	unsigned long	bi_sramsize;	/* size	 of SRAM memory */
-	unsigned long	bi_bootflags;	/* boot / reboot flag (for LynxOS) */
-	unsigned short	bi_ethspeed;	/* Ethernet speed in Mbps */
-	unsigned long	bi_intfreq;	/* Internal Freq, in MHz */
-	unsigned long	bi_busfreq;	/* Bus Freq, in MHz */
-	unsigned int	bi_baudrate;	/* Console Baudrate */
-	unsigned long   bi_boot_params;	/* where this board expects params */
-	struct				/* RAM configuration */
-	{
-		ulong start;
-		ulong size;
-	} bi_dram[CONFIG_NR_DRAM_BANKS];
-} bd_t;
+/* Use the generic board which requires a unified bd_info */
+#include <asm-generic/u-boot.h>
 
 /* For image.h:image_check_target_arch() */
 #define IH_ARCH_DEFAULT IH_ARCH_SANDBOX
diff --git a/arch/sandbox/lib/Makefile b/arch/sandbox/lib/Makefile
index fbe579b..3aad574 100644
--- a/arch/sandbox/lib/Makefile
+++ b/arch/sandbox/lib/Makefile
@@ -27,7 +27,6 @@  include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(ARCH).o
 
-COBJS-y	+= board.o
 COBJS-y	+= interrupts.o
 
 SRCS	:= $(COBJS-y:.o=.c)
diff --git a/arch/sandbox/lib/board.c b/arch/sandbox/lib/board.c
deleted file mode 100644
index 3752fab..0000000
--- a/arch/sandbox/lib/board.c
+++ /dev/null
@@ -1,285 +0,0 @@ 
-/*
- * Copyright (c) 2011 The Chromium OS Authors.
- *
- * (C) Copyright 2002-2006
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Marius Groeger <mgroeger@sysgo.de>
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-/*
- * This file was taken from ARM and changed to remove things we don't
- * need. This is most of it, so have tried to avoid being over-zealous!
- * For example, we want to have an emulation of the 'DRAM' used by
- * U-Boot.
- *
- * has been talk upstream of unifying the architectures w.r.t board.c,
- * so the less change here the better.
- */
-
-#include <common.h>
-#include <command.h>
-#include <malloc.h>
-#include <stdio_dev.h>
-#include <timestamp.h>
-#include <version.h>
-#include <serial.h>
-
-#include <os.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-static gd_t gd_mem;
-
-/************************************************************************
- * Init Utilities							*
- ************************************************************************
- * Some of this code should be moved into the core functions,
- * or dropped completely,
- * but let's get it working (again) first...
- */
-
-static int display_banner(void)
-{
-	display_options();
-
-	return 0;
-}
-
-/**
- * Configure and report on the DRAM configuration, which in our case is
- * fairly simple.
- */
-static int display_dram_config(void)
-{
-	ulong size = 0;
-	int i;
-
-	debug("RAM Configuration:\n");
-
-	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
-#ifdef DEBUG
-		printf("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
-		print_size(gd->bd->bi_dram[i].size, "\n");
-#endif
-		size += gd->bd->bi_dram[i].size;
-	}
-	puts("DRAM:  ");
-	print_size(size, "\n");
-	return 0;
-}
-
-/*
- * Breathe some life into the board...
- *
- * Initialize a serial port as console, and carry out some hardware
- * tests.
- *
- * The first part of initialization is running from Flash memory;
- * its main purpose is to initialize the RAM so that we
- * can relocate the monitor code to RAM.
- */
-
-/*
- * All attempts to come up with a "common" initialization sequence
- * that works for all boards and architectures failed: some of the
- * requirements are just _too_ different. To get rid of the resulting
- * mess of board dependent #ifdef'ed code we now make the whole
- * initialization sequence configurable to the user.
- *
- * The requirements for any new initalization function is simple: it
- * receives a pointer to the "global data" structure as it's only
- * argument, and returns an integer return code, where 0 means
- * "continue" and != 0 means "fatal error, hang the system".
- */
-typedef int (init_fnc_t) (void);
-
-void __dram_init_banksize(void)
-{
-	gd->bd->bi_dram[0].start = 0;
-	gd->bd->bi_dram[0].size =  gd->ram_size;
-}
-
-void dram_init_banksize(void)
-	__attribute__((weak, alias("__dram_init_banksize")));
-
-init_fnc_t *init_sequence[] = {
-#if defined(CONFIG_ARCH_CPU_INIT)
-	arch_cpu_init,		/* basic arch cpu dependent setup */
-#endif
-#if defined(CONFIG_BOARD_EARLY_INIT_F)
-	board_early_init_f,
-#endif
-	timer_init,		/* initialize timer */
-	env_init,		/* initialize environment */
-	serial_init,		/* serial communications setup */
-	console_init_f,		/* stage 1 init of console */
-	sandbox_early_getopt_check,	/* process command line flags (err/help) */
-	display_banner,		/* say that we are here */
-#if defined(CONFIG_DISPLAY_CPUINFO)
-	print_cpuinfo,		/* display cpu info (and speed) */
-#endif
-#if defined(CONFIG_DISPLAY_BOARDINFO)
-	checkboard,		/* display board info */
-#endif
-	dram_init,		/* configure available RAM banks */
-	NULL,
-};
-
-void board_init_f(ulong bootflag)
-{
-	init_fnc_t **init_fnc_ptr;
-	uchar *mem;
-	unsigned long addr_sp, addr, size;
-
-	gd = &gd_mem;
-	assert(gd);
-
-	memset((void *)gd, 0, sizeof(gd_t));
-
-#if defined(CONFIG_OF_EMBED)
-	/* Get a pointer to the FDT */
-	gd->fdt_blob = _binary_dt_dtb_start;
-#elif defined(CONFIG_OF_SEPARATE)
-	/* FDT is at end of image */
-	gd->fdt_blob = (void *)(_end_ofs + _TEXT_BASE);
-#endif
-
-	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
-		if ((*init_fnc_ptr)() != 0)
-			hang();
-	}
-
-	size = CONFIG_SYS_SDRAM_SIZE;
-	mem = os_malloc(CONFIG_SYS_SDRAM_SIZE);
-
-	assert(mem);
-	gd->arch.ram_buf = mem;
-	addr = (ulong)(mem + size);
-
-	/*
-	 * reserve memory for malloc() arena
-	 */
-	addr_sp = addr - TOTAL_MALLOC_LEN;
-	debug("Reserving %dk for malloc() at: %08lx\n",
-			TOTAL_MALLOC_LEN >> 10, addr_sp);
-	/*
-	 * (permanently) allocate a Board Info struct
-	 * and a permanent copy of the "global" data
-	 */
-	addr_sp -= sizeof(bd_t);
-	gd->bd = (bd_t *) addr_sp;
-	debug("Reserving %zu Bytes for Board Info at: %08lx\n",
-			sizeof(bd_t), addr_sp);
-
-	/* Ram ist board specific, so move it to board code ... */
-	dram_init_banksize();
-	display_dram_config();	/* and display it */
-
-	/* We don't relocate, so just run the post-relocation code */
-	board_init_r(NULL, 0);
-
-	/* NOTREACHED - no way out of command loop except booting */
-}
-
-/************************************************************************
- *
- * This is the next part if the initialization sequence: we are now
- * running from RAM and have a "normal" C environment, i. e. global
- * data can be written, BSS has been cleared, the stack size in not
- * that critical any more, etc.
- *
- ************************************************************************
- */
-
-void board_init_r(gd_t *id, ulong dest_addr)
-{
-
-	if (id)
-		gd = id;
-
-	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */
-
-	serial_initialize();
-
-#ifdef CONFIG_POST
-	post_output_backlog();
-#endif
-
-	/* The Malloc area is at the top of simulated DRAM */
-	mem_malloc_init((ulong)gd->arch.ram_buf + gd->ram_size -
-			TOTAL_MALLOC_LEN, TOTAL_MALLOC_LEN);
-
-	/* initialize environment */
-	env_relocate();
-
-	stdio_init();	/* get the devices list going. */
-
-	jumptable_init();
-
-	console_init_r();	/* fully init console as a device */
-
-#if defined(CONFIG_DISPLAY_BOARDINFO_LATE)
-	checkboard();
-#endif
-
-#if defined(CONFIG_ARCH_MISC_INIT)
-	/* miscellaneous arch dependent initialisations */
-	arch_misc_init();
-#endif
-#if defined(CONFIG_MISC_INIT_R)
-	/* miscellaneous platform dependent initialisations */
-	misc_init_r();
-#endif
-
-	 /* set up exceptions */
-	interrupt_init();
-	/* enable exceptions */
-	enable_interrupts();
-
-#ifdef CONFIG_BOARD_LATE_INIT
-	board_late_init();
-#endif
-
-#ifdef CONFIG_POST
-	post_run(NULL, POST_RAM | post_bootmode_get(0));
-#endif
-
-	sandbox_main_loop_init();
-
-	/*
-	 * For now, run the main loop. Later we might let this be done
-	 * in the main program.
-	 */
-	while (1)
-		main_loop();
-
-	/* NOTREACHED - no way out of command loop except booting */
-}
-
-void hang(void)
-{
-	puts("### ERROR ### Please RESET the board ###\n");
-	for (;;)
-		;
-}
diff --git a/board/sandbox/sandbox/sandbox.c b/board/sandbox/sandbox/sandbox.c
index 9883013..8bdba92 100644
--- a/board/sandbox/sandbox/sandbox.c
+++ b/board/sandbox/sandbox/sandbox.c
@@ -56,6 +56,6 @@  int timer_init(void)
 
 int dram_init(void)
 {
-	gd->ram_size = CONFIG_DRAM_SIZE;
+	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
 	return 0;
 }
diff --git a/common/board_f.c b/common/board_f.c
index 00ca811..2045055 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -49,9 +49,11 @@ 
 #include <mpc5xxx.h>
 #endif
 
+#include <os.h>
 #include <post.h>
 #include <spi.h>
 #include <watchdog.h>
+#include <asm/errno.h>
 #include <asm/io.h>
 #ifdef CONFIG_MP
 #include <asm/mp.h>
@@ -61,6 +63,9 @@ 
 #include <asm/init_helpers.h>
 #include <asm/relocate.h>
 #endif
+#ifdef CONFIG_SANDBOX
+#include <asm/state.h>
+#endif
 #include <linux/compiler.h>
 
 /*
@@ -155,6 +160,7 @@  static int init_baud_rate(void)
 
 static int display_text_info(void)
 {
+#ifndef CONFIG_SANDBOX
 	ulong bss_start, bss_end;
 
 #ifdef CONFIG_SYS_SYM_OFFSETS
@@ -166,6 +172,7 @@  static int display_text_info(void)
 #endif
 	debug("U-Boot code: %08X -> %08lX  BSS: -> %08lX\n",
 	      CONFIG_SYS_TEXT_BASE, bss_start, bss_end);
+#endif
 
 #ifdef CONFIG_MODEM_SUPPORT
 	debug("Modem Support enabled\n");
@@ -284,6 +291,8 @@  static int setup_mon_len(void)
 {
 #ifdef CONFIG_SYS_SYM_OFFSETS
 	gd->mon_len = _bss_end_ofs;
+#elif defined(CONFIG_SANDBOX)
+	gd->mon_len = (ulong)&_end - (ulong)_init;
 #else
 	/* TODO: use (ulong)&__bss_end - (ulong)&__text_start; ? */
 	gd->mon_len = (ulong)&__bss_end - CONFIG_SYS_MONITOR_BASE;
@@ -296,6 +305,17 @@  __weak int arch_cpu_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_SANDBOX
+static int setup_ram_buf(void)
+{
+	gd->arch.ram_buf = os_malloc(CONFIG_SYS_SDRAM_SIZE);
+	assert(gd->arch.ram_buf);
+	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
+
+	return 0;
+}
+#endif
+
 static int setup_fdt(void)
 {
 #ifdef CONFIG_OF_EMBED
@@ -470,7 +490,7 @@  static int reserve_malloc(void)
 static int reserve_board(void)
 {
 	gd->dest_addr_sp -= sizeof(bd_t);
-	gd->bd = (bd_t *)gd->dest_addr_sp;
+	gd->bd = (bd_t *)map_sysmem(gd->dest_addr_sp, sizeof(bd_t));
 	memset(gd->bd, '\0', sizeof(bd_t));
 	debug("Reserving %zu Bytes for Board Info at: %08lx\n",
 			sizeof(bd_t), gd->dest_addr_sp);
@@ -489,7 +509,7 @@  static int setup_machine(void)
 static int reserve_global_data(void)
 {
 	gd->dest_addr_sp -= sizeof(gd_t);
-	gd->new_gd = (gd_t *)gd->dest_addr_sp;
+	gd->new_gd = (gd_t *)map_sysmem(gd->dest_addr_sp, sizeof(gd_t));
 	debug("Reserving %zu Bytes for Global Data at: %08lx\n",
 			sizeof(gd_t), gd->dest_addr_sp);
 	return 0;
@@ -506,9 +526,9 @@  static int reserve_fdt(void)
 		gd->fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32);
 
 		gd->dest_addr_sp -= gd->fdt_size;
-		gd->new_fdt = (void *)gd->dest_addr_sp;
-		debug("Reserving %lu Bytes for FDT at: %p\n",
-		      gd->fdt_size, gd->new_fdt);
+		gd->new_fdt = map_sysmem(gd->dest_addr_sp, gd->fdt_size);
+		debug("Reserving %lu Bytes for FDT at: %08lx\n",
+		      gd->fdt_size, gd->dest_addr_sp);
 	}
 
 	return 0;
@@ -709,8 +729,9 @@  static int setup_reloc(void)
 	memcpy(gd->new_gd, (char *)gd, sizeof(gd_t));
 
 	debug("Relocation Offset is: %08lx\n", gd->reloc_off);
-	debug("Relocating to %08lx, new gd at %p, sp at %08lx\n",
-	      gd->dest_addr, gd->new_gd, gd->dest_addr_sp);
+	debug("Relocating to %08lx, new gd at %08lx, sp at %08lx\n",
+	      gd->dest_addr, (ulong)map_to_sysmem(gd->new_gd),
+	      gd->dest_addr_sp);
 
 	return 0;
 }
@@ -736,6 +757,8 @@  static int jump_to_copy(void)
 	 * (CPU cache)
 	 */
 	board_init_f_r_trampoline(gd->start_addr_sp);
+#elif defined(CONFIG_SANDBOX)
+	board_init_r(gd->new_gd, 0);
 #else
 	relocate_code(gd->dest_addr_sp, gd->new_gd, gd->dest_addr);
 #endif
@@ -758,6 +781,9 @@  static init_fnc_t init_sequence_f[] = {
 		!defined(CONFIG_MPC86xx) && !defined(CONFIG_X86)
 	zero_global_data,
 #endif
+#ifdef CONFIG_SANDBOX
+	setup_ram_buf,
+#endif
 	setup_fdt,
 	setup_mon_len,
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
@@ -816,8 +842,11 @@  static init_fnc_t init_sequence_f[] = {
 	init_baud_rate,		/* initialze baudrate settings */
 	serial_init,		/* serial communications setup */
 	console_init_f,		/* stage 1 init of console */
-#if defined(CONFIG_X86) && defined(CONFIG_OF_CONTROL)
-	prepare_fdt,		/* TODO(sjg@chromium.org): remove */
+#ifdef CONFIG_SANDBOX
+	sandbox_early_getopt_check,
+#endif
+#ifdef CONFIG_OF_CONTROL
+	fdtdec_prepare_fdt,
 #endif
 	display_options,	/* say that we are here */
 	display_text_info,	/* show debugging info if required */
@@ -1007,5 +1036,9 @@  void board_init_f_r(void)
 void hang(void)
 {
 	puts("### ERROR ### Please RESET the board ###\n");
+#ifdef CONFIG_SANDBOX
+	os_exit(0);
+#else
 	for (;;);
+#endif
 }
diff --git a/common/board_r.c b/common/board_r.c
index 2b17fa6..f801e41 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -136,7 +136,7 @@  static int initr_reloc_global_data(void)
 {
 #ifdef CONFIG_SYS_SYM_OFFSETS
 	monitor_flash_len = _end_ofs;
-#else
+#elif !defined(CONFIG_SANDBOX)
 	monitor_flash_len = (ulong)&__init_end - gd->dest_addr;
 #endif
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
@@ -264,7 +264,8 @@  static int initr_malloc(void)
 
 	/* The malloc area is immediately below the monitor copy in DRAM */
 	malloc_start = gd->dest_addr - TOTAL_MALLOC_LEN;
-	mem_malloc_init(malloc_start, TOTAL_MALLOC_LEN);
+	mem_malloc_init((ulong)map_sysmem(malloc_start, TOTAL_MALLOC_LEN),
+			TOTAL_MALLOC_LEN);
 	return 0;
 }
 
@@ -691,6 +692,9 @@  static int initr_modem(void)
 
 static int run_main_loop(void)
 {
+#ifdef CONFIG_SANDBOX
+	sandbox_main_loop_init();
+#endif
 	/* main_loop() can return to retry autoboot, if so just run it again */
 	for (;;)
 		main_loop();
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index cca1edb..4b39844 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -29,7 +29,7 @@  extern char _data[], _sdata[], _edata[];
 extern char __bss_start[], __bss_stop[];
 extern char __init_begin[], __init_end[];
 extern char _sinittext[], _einittext[];
-extern char _end[];
+extern char _end[], _init[];
 extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
 extern char __kprobes_text_start[], __kprobes_text_end[];
 extern char __entry_text_start[], __entry_text_end[];
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 406da43..da7cc9a 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -22,9 +22,6 @@ 
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
-#define CONFIG_NR_DRAM_BANKS	1
-#define CONFIG_DRAM_SIZE	(128 << 20)
-
 /* Number of bits in a C 'long' on this architecture */
 #define CONFIG_SANDBOX_BITS_PER_LONG	64
 
@@ -76,7 +73,11 @@ 
 #define CONFIG_PHYS_64BIT
 
 /* Size of our emulated memory */
+#define CONFIG_SYS_SDRAM_BASE		0
 #define CONFIG_SYS_SDRAM_SIZE		(128 << 20)
+#define CONFIG_SYS_TEXT_BASE		0
+#define CONFIG_SYS_MONITOR_BASE	0
+#define CONFIG_NR_DRAM_BANKS		1
 
 #define CONFIG_BAUDRATE			115200
 #define CONFIG_SYS_BAUDRATE_TABLE	{4800, 9600, 19200, 38400, 57600,\
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 92fbefe..60369fb 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -357,7 +357,7 @@  int fdtdec_prepare_fdt(void)
 	if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) {
 		printf("No valid FDT found - please append one to U-Boot "
 			"binary, use u-boot-dtb.bin or define "
-			"CONFIG_OF_EMBED\n");
+			"CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
 		return -1;
 	}
 	return 0;