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: Cédric Schieli <cschi...@gmail.com>
---
Changes in v4:
- add save_boot_params hook for ARM1176 to make the passthrough work
on ARMv6-based original Pis
Changes in v3: None
Changes in v2: None
arch/arm/cpu/arm1176/start.S | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S
index a602d4e..7c00201 100644
--- a/arch/arm/cpu/arm1176/start.S
+++ b/arch/arm/cpu/arm1176/start.S
@@ -16,6 +16,7 @@
#include <asm-offsets.h>
#include <config.h>
+#include <linux/linkage.h>
#ifndef CONFIG_SYS_PHY_UBOOT_BASE
#define CONFIG_SYS_PHY_UBOOT_BASE CONFIG_SYS_UBOOT_BASE
@@ -37,6 +38,11 @@
.globl reset
reset:
+ /* Allow the board to save important registers */
+ b save_boot_params
+.globl save_boot_params_ret
+save_boot_params_ret:
+
/*
* set the cpu to SVC32 mode
*/
@@ -110,3 +116,7 @@ mmu_disable_phys:
c_runtime_cpu_setup:
mov pc, lr
+
+WEAK(save_boot_params)
+ b save_boot_params_ret /* back to my caller */
+ENDPROC(save_boot_params)
--
2.7.3
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