ppc4xx: Clear all potentially pending exceptions in MCSR

This is needed on Canyonlands which still has an exception pending
while running relocate_code(). This leads to a failure after trap_init()
is moved to the top of board_init_r().

Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index 882ef21..84d7a28 100644 (file)
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -1440,6 +1440,10 @@ relocate_code:
        dccci   0,0                     /* Invalidate data cache, now no longer our stack */
        sync
        isync
+
+       /* Clear all potential pending exceptions */
+       mfspr   r1,mcsr
+       mtspr   mcsr,r1
 #ifdef CONFIG_SYS_TLB_FOR_BOOT_FLASH
        addi    r1,r0,CONFIG_SYS_TLB_FOR_BOOT_FLASH     /* Use defined TLB */
 #else