[U-Boot] [PATCH] armv7: Fix infinite loop for the spl boot

[Zhong Hongbo]

From: Zhong Hongbo <bocui107 at 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 at 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
-- 
1.7.5.4