[U-Boot] [PATCH 04/22] armv7: start.S: provide a hook for saving boot params

[Aneesh V]

Provide a means by which u-boot/SPL can save parameters passed
to it by ROM code or the pre-loader.

A new function 'save_boot_params' has been defined and a default
implentation provided. Please note that we do not have a stack yet.
So, any implementation of this function should not use stack.

Signed-off-by: Aneesh V <aneesh at ti.com>
---
 arch/arm/cpu/armv7/cpu.c   |    7 +++++++
 arch/arm/cpu/armv7/start.S |    1 +
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
index a01e0d6..54533fc 100644
--- a/arch/arm/cpu/armv7/cpu.c
+++ b/arch/arm/cpu/armv7/cpu.c
@@ -41,6 +41,13 @@
 
 static void cache_flush(void);
 
+void save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3)
+{
+}
+
+void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
+	__attribute__((weak, alias("save_boot_params_default")));
+
 int cleanup_before_linux(void)
 {
 	unsigned int i;
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index cb4f92f..3618190 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -103,6 +103,7 @@ IRQ_STACK_START_IN:
  */
 
 reset:
+	bl	save_boot_params
 	/*
 	 * set the cpu to SVC32 mode
 	 */
-- 
1.7.0.4