mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 14:23:00 +00:00
45f41c134b
When booting from ARM Trusted Firmware, U-Boot runs in EL1-NS. The boot flow is as follows: BL1 -> BL2 -> BL31 -> BL33 (i.e. U-Boot) This boot sequence works fine for LD11 SoC (Cortex-A53), but LD20 SoC (Cortex-A72) hangs in U-Boot. The solution I found is to read sctlr_el1 and write back the value as-is. This should be no effect, but surprisingly fixes the problem for LD20 to boot. I do not know why. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
14 lines
266 B
ArmAsm
14 lines
266 B
ArmAsm
/*
|
|
* Copyright (C) 2017 Socionext Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
ENTRY(lowlevel_init)
|
|
/* LD20 needs the following code to boot. I do not know why. */
|
|
mrs x0, sctlr_el1
|
|
msr sctlr_el1, x0
|
|
ret
|
|
ENDPROC(lowlevel_init)
|