[U-Boot] [PATCH] mpc83xx: Make it boot again

[Joakim Tjernlund]

After the removal of COLD/WARM start flags my mpc8321
board didn't boot anymore.
Trial and error suggests that map_flash_by_law1 needs
an isync(padding with 4 nop's also did the trick)
after updating LBLAWAR1 to make sure the the change has
reached the HW before continuing with the code that depends on it.
Add an isync to remap_flash_by_law0 for good measure too.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund at transmode.se>
---
 arch/powerpc/cpu/mpc83xx/start.S |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S
index e8b1ebc..d3ec580 100644
--- a/arch/powerpc/cpu/mpc83xx/start.S
+++ b/arch/powerpc/cpu/mpc83xx/start.S
@@ -1191,6 +1191,7 @@ map_flash_by_law1:
 	bne 1b
 
 	stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
+	isync /* Wait for HW to catch up */
 	blr
 
 	/* Though all the LBIU Local Access Windows and LBC Banks will be
@@ -1229,5 +1230,6 @@ remap_flash_by_law0:
 	xor r4, r4, r4
 	stw r4, LBLAWBAR1(r3)
 	stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
+	isync /* Wait for HW to catch up */
 	blr
 #endif /* CONFIG_SYS_FLASHBOOT */
-- 
1.7.2.2