nios2: fix cached mode in clearing the BSS
As the generic board runs in cached mode, it should not use
"stwio" which bypass the cache.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Chin Liang See <clsee@altera.com>
diff --git a/arch/nios2/cpu/start.S b/arch/nios2/cpu/start.S
index bb86bbf..54787c5 100644
--- a/arch/nios2/cpu/start.S
+++ b/arch/nios2/cpu/start.S
@@ -158,7 +158,7 @@
ori r6, r6, %lo(__bss_end)
beq r5, r6, 5f
-4: stwio r0, 0(r5)
+4: stw r0, 0(r5)
addi r5, r5, 4
bne r5, r6, 4b
5: