ARM: Add save_boot_params for ARMv8
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>
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index 67edf94..19c771d 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -53,6 +53,11 @@
.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 @@
ret
ENDPROC(c_runtime_cpu_setup)
+
+WEAK(save_boot_params)
+ b save_boot_params_ret /* back to my caller */
+ENDPROC(save_boot_params)