From: Zhong Hongbo bocui107@gmail.com
In the spl booting step, When __bss_start is equal to __bss_end__, The loop will clear all the things in CPU space. If there are have the same address for this symbol, To skip the clear bss section.
Signed-off-by: Hongbo Zhong bocui107@gmail.com --- arch/arm/cpu/armv7/start.S | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 76ccef1..c72f337 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -258,6 +258,8 @@ clear_bss: /* No relocation for SPL */ ldr r0, =__bss_start ldr r1, =__bss_end__ + cmp r0, r1 + beq skip_clbss #else ldr r0, _bss_start_ofs ldr r1, _bss_end_ofs @@ -271,6 +273,7 @@ clbss_l:str r2, [r0] /* clear loop... */ add r0, r0, #4 cmp r0, r1 bne clbss_l +skip_clbss:
/* * We are done. Do not return, instead branch to second part of board