[U-Boot] [PATCH] armv7: Fix to mistake clean the memory space

[Zhong Hongbo]

From: Zhong Hongbo <bocui107 at gmail.com>

In currently, when __bss_start is equal to __bss_end__,
The bss loop will clear all the things in memory space.

But just only when __bss_end__ greater than __bss_start__,
we do the clear bss section operation.

Signed-off-by: Hongbo Zhong <bocui107 at gmail.com>
---
 arch/arm/cpu/armv7/start.S |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 22a3ced..2e583ee 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -259,10 +259,13 @@ clear_bss:
 #endif
 	mov	r2, #0x00000000		/* clear			    */
 
-clbss_l:str	r2, [r0]		/* clear loop...		    */
+clbss_l:
+	cmp	r1, r0
+	bls	clbss_end
+	str	r2, [r0]		/* clear loop...		    */
 	add	r0, r0, #4
-	cmp	r0, r1
-	bne	clbss_l
+	b	clbss_l
+clbss_end:
 
 /*
  * We are done. Do not return, instead branch to second part of board
-- 
1.7.5.4