From: Alistair Buxton a.j.buxton@gmail.com
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 db8e9d2..8a456f0 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -134,6 +134,22 @@ IRQ_STACK_START_IN: */
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 bl save_boot_params /* * set the cpu to SVC32 mode