diff options
Diffstat (limited to 'recipes/u-boot/u-boot-git/nokia900/0003-Store-existing-atags-at-startup-if-chainloading.patch')
-rw-r--r-- | recipes/u-boot/u-boot-git/nokia900/0003-Store-existing-atags-at-startup-if-chainloading.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/recipes/u-boot/u-boot-git/nokia900/0003-Store-existing-atags-at-startup-if-chainloading.patch b/recipes/u-boot/u-boot-git/nokia900/0003-Store-existing-atags-at-startup-if-chainloading.patch new file mode 100644 index 0000000000..42317157a0 --- /dev/null +++ b/recipes/u-boot/u-boot-git/nokia900/0003-Store-existing-atags-at-startup-if-chainloading.patch @@ -0,0 +1,45 @@ +From f84df2f55ac133d9ff4cbc14d0eff812ee891b38 Mon Sep 17 00:00:00 2001 +From: Alistair Buxton <a.j.buxton@gmail.com> +Date: Wed, 1 Sep 2010 23:04:03 +0100 +Subject: [PATCH 3/9] Store existing atags at startup if chainloading. + +This patch stores the values in r1 and r2 at startup. It also stores the address +which u-boot was originally loaded to. This is useful if you feed some other +bootloader a u-boot.bin instead of the linux kernel it was expecting. It is +rather ugly because it stores these values in an arbitrary memory address. + +Signed-off-by: Alistair Buxton <a.j.buxton@gmail.com> +--- + arch/arm/cpu/armv7/start.S | 16 ++++++++++++++++ + 1 files changed, 16 insertions(+), 0 deletions(-) + +diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S +index 1e0a150..bdea26c 100644 +--- a/arch/arm/cpu/armv7/start.S ++++ b/arch/arm/cpu/armv7/start.S +@@ -100,6 +100,22 @@ FIQ_STACK_START: + */ + + reset: ++#if (CONFIG_CHAINLOADER) ++ /* ++ * Ugly hack: store the u-boot load address and kernel params ++ * 0x82000004: address where this image was loaded ++ * 0x82000008: mach_type ++ * 0x8200000c: atags address ++ */ ++ adr r0, _start ++ mov r3, #0x82000000 ++ add r3, r3, #4 ++ str r0, [r3] ++ add r3, r3, #4 ++ str r1, [r3] ++ add r3, r3, #4 ++ str r2, [r3] ++#endif + /* + * set the cpu to SVC32 mode + */ +-- +1.7.3.2 + |