@@ -16,6 +16,7 @@ struct pass_over_info_t {
u32 g_ap_mu;
};
+extern unsigned long boot_pointer[];
void build_info(void);
enum boot_device get_boot_device(void);
int print_bootinfo(void);
@@ -4,7 +4,7 @@
# SPDX-License-Identifier: GPL-2.0+
#
-obj-y += cpu.o iomux.o misc.o
+obj-y += cpu.o iomux.o misc.o lowlevel_init.o
obj-$(CONFIG_OF_SYSTEM_SETUP) += fdt.o
ifdef CONFIG_SPL_BUILD
new file mode 100644
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019 NXP
+ */
+
+#include <config.h>
+
+.align 8
+.global boot_pointer
+boot_pointer:
+ .space 32
+
+/*
+ * Routine: save_boot_params (called after reset from start.S)
+ */
+
+.global save_boot_params
+save_boot_params:
+ /* The firmware provided ATAG/FDT address can be found in r2/x0 */
+ adr x0, boot_pointer
+ stp x1, x2, [x0], #16
+ stp x3, x4, [x0], #16
+
+ /*
+ * We use absolute address not PC relative address for return.
+ * When running SPL on iMX8, the A core starts at address 0,
+ * an alias to OCRAM 0x100000, our linker address for SPL is
+ * from 0x100000. So using absolute address can jump to the OCRAM
+ * address from the alias. The alias only map first 96KB of OCRAM,
+ * so this require the SPL size can't beyond 96KB.
+ * But when using SPL DM, the size increase significantly and
+ * always beyonds 96KB. That's why we have to jump to OCRAM.
+ * Normal u-boot also runs into this codes, but there is no impact.
+ */
+ ldr x1, =save_boot_params_ret
+ br x1
We use information from ATF to know whether OP-TEE is running or not. So save args passed from ATF. Signed-off-by: Peng Fan <peng.fan@nxp.com> --- arch/arm/include/asm/arch-imx8/sys_proto.h | 1 + arch/arm/mach-imx/imx8/Makefile | 2 +- arch/arm/mach-imx/imx8/lowlevel_init.S | 36 ++++++++++++++++++++++++++++++ 3 files changed, 38 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-imx/imx8/lowlevel_init.S