Initialize CP0 Cause before setting up CP0 Status register

U-Boot-Users Shinya Kuribayashi 1 participant 1 message Mar 22, 2008

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Shinya Kuribayashi

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2008-03-22 04:19 UTC #0 lore raw

Without this change, we'll be suffering from deffered WATCH exception once Status.EXL is cleared. Make sure Cause.WP is cleared.

Signed-off-by Shinya Kuribayashi <[email protected]>

---

 cpu/mips/start.S |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

cpu/mips/start.S +3 -3

index fde2944..0ecdd83 100644
@@ -211,6 +211,9 @@ reset:
 	mtc0	zero, CP0_WATCHLO
 	mtc0	zero, CP0_WATCHHI
 
+	/* WP(Watch Pending), SW0/1 should be cleared. */
+	mtc0	zero, CP0_CAUSE
+
 	/* STATUS register */
 #ifdef  CONFIG_TB0229
 	li	k0, ST0_CU0

@@ -221,9 +224,6 @@ reset:
 	and	k0, k1
 	mtc0	k0, CP0_STATUS
 
-	/* CAUSE register */
-	mtc0	zero, CP0_CAUSE
-
 	/* Init Timer */
 	mtc0	zero, CP0_COUNT
 	mtc0	zero, CP0_COMPARE