u-boot/arch/arm/mach-rockchip/save_boot_param.S
Simon Glass e1bc64eec2 rockchip: Print a message when returning to the bootrom
At present if the return to bootrom fails (e.g. because you are not using
the Rockchip's bootrom's pointer table in MMC) then the board prints
SPL message and hangs. Print a message first if we can, to help in
understanding what happened when it hangs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Heiko Stuebner <heiko@sntech.de>
2017-04-18 10:29:26 -04:00

32 lines
534 B
ArmAsm

/*
* (C) Copyright 2016 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <linux/linkage.h>
.globl SAVE_SP_ADDR
SAVE_SP_ADDR:
.word 0
/*
* void save_boot_params
*
* Save sp, lr, r1~r12
*/
ENTRY(save_boot_params)
push {r1-r12, lr}
ldr r0, =SAVE_SP_ADDR
str sp, [r0]
b save_boot_params_ret @ back to my caller
ENDPROC(save_boot_params)
.globl _back_to_bootrom_s
ENTRY(_back_to_bootrom_s)
ldr r0, =SAVE_SP_ADDR
ldr sp, [r0]
mov r0, #0
pop {r1-r12, pc}
ENDPROC(_back_to_bootrom_s)