[U-Boot] [PATCH v6] arm, arm926ejs: Fix clear bss loop for zero length bss

[Christian Riesch]

This patch fixes the clear bss loop for bss sections that have
zero length, i.e., where __bss_start == __bss_end__.

Signed-off-by: Christian Riesch <christian.riesch at omicron.at>
Cc: Albert Aribaud <albert.u.boot at aribaud.net>
---

Hi,
this is v6 of a patch out of my recent patchset

[PATCH v3 00/15] Add an SPL to boot the da850evm from SPI
http://lists.denx.de/pipermail/u-boot/2011-November/111182.html

Changes for v6:
- replace beq clbss_e to allow for cases where r1-r0 is not a multiple of 4,
  as suggested by Albert Aribaud.

Changes for v5:
- correct subject line

Changes for v4:
- split the patchset since it is getting quite big

Regards, Christian


 arch/arm/cpu/arm926ejs/start.S |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
index 8b5355b..6a09c02 100644
--- a/arch/arm/cpu/arm926ejs/start.S
+++ b/arch/arm/cpu/arm926ejs/start.S
@@ -299,10 +299,12 @@ clear_bss:
 #endif
 	mov	r2, #0x00000000		/* clear			    */
 
-clbss_l:str	r2, [r0]		/* clear loop...		    */
+clbss_l:cmp	r0, r1			/* clear loop... */
+	bhs	clbss_e			/* if reached end of bss, exit */
+	str	r2, [r0]
 	add	r0, r0, #4
-	cmp	r0, r1
-	bne	clbss_l
+	b	clbss_l
+clbss_e:
 
 #ifndef CONFIG_SPL_BUILD
 	bl coloured_LED_init
-- 
1.7.0.4