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ARM: Add save_boot_params for ARMv8

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Implement a hook to allow boards to save boot-time CPU state for later
use. When U-Boot is chain-loaded by another bootloader, CPU registers may
contain useful information such as system configuration information. This
feature mirrors the equivalent ARMv7 feature.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Stephen Warren 2016-07-18 17:01:50 -06:00 committed by Tom Warren
parent efbb3d491e
commit 0e2b5350d9
1 changed files with 9 additions and 0 deletions
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9
arch/arm/cpu/armv8/start.S
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@ -53,6 +53,11 @@ _bss_end_ofs:
.quad __bss_end - _start
reset:
/* Allow the board to save important registers */
b save_boot_params
.globl save_boot_params_ret
save_boot_params_ret:
#ifdef CONFIG_SYS_RESET_SCTRL
bl reset_sctrl
#endif
@ -282,3 +287,7 @@ ENTRY(c_runtime_cpu_setup)
ret
ENDPROC(c_runtime_cpu_setup)
WEAK(save_boot_params)
b save_boot_params_ret /* back to my caller */
ENDPROC(save_boot_params)