| Message ID | 1478861947-28786-2-git-send-email-cschieli@gmail.com |
|---|---|
| State | Accepted |
| Commit | 3e10fcde3f3c24a488866dd33fa3f5d46ff3d7a3 |
| Delegated to: | Tom Rini |
| Headers | show |
On 11/11/2016 03:59 AM, Cédric Schieli wrote: > 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. Acked-by: Stephen Warren <swarren@nvidia.com>
On Fri, Nov 11, 2016 at 11:59:06AM +0100, Cédric Schieli wrote: > 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 <cschieli@gmail.com> > Acked-by: Stephen Warren <swarren@nvidia.com> Applied to u-boot/master, thanks!
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)
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 <cschieli@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(+)