ARM: fixed relocation using proper alignment

Using u-boot-2017.05 on i.MX6UL we ran into following problem:
Initially U-Boot could be started normally.
If we added one random command in configuration, the newly generated
image hung at startup (last output was DRAM:  256 MiB).

We tracked this down to a data abort within relocation (relocated_code).

relocated_code in arch/arm/lib/relocate.S copies 8 bytes per loop
iteration until the source pointer is equal to __image_copy_end.
In a good case __image_copy_end was aligned to 8 bytes, so the loop
stopped as suggested, but in an errornous case __image_copy_end was
not aligned to 8 bytes, so the loop ran out of bounds and caused a
data abort exception.

This patches solves the issue by aligning __image_copy_end to 8 byte
using the linker script related to arm.

I don't know if it's the correct way to solve this, so some review would
be very appreciated.

diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds
index 37d4c605aca3256032974302c2f6b916fb3731d0..70bee1a3f8a776dbdfad882ba429c883ba39e2bf 100644 (file)
--- a/arch/arm/cpu/u-boot.lds
+++ b/arch/arm/cpu/u-boot.lds
@@ -165,7 +165,7 @@ SECTIONS
                *(.__efi_runtime_rel_stop)
        }
 
-       . = ALIGN(4);
+       . = ALIGN(8);
 
        .image_copy_end :
        {