From e45c98ad35ca600e25e9264528e7b6be17969f8c Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund Date: Fri, 19 Nov 2010 14:15:33 +0100 Subject: mpc83xx: Make it boot again After the removal of COLD/WARM start flags my mpc8321 board didn't boot anymore. Trial and error suggests that map/remap_flash_by_xxx needs to wait after updating LBLAWAR1 to make sure the the change has reached the HW before continuing with the code that depends on it. Final fix suggested by Scott Wood. Signed-off-by: Joakim Tjernlund Acked-by: Scott Wood Signed-off-by: Kim Phillips --- arch/powerpc/cpu/mpc83xx/start.S | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/powerpc/cpu/mpc83xx') diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S index 515be4c871..460ac9aabb 100644 --- a/arch/powerpc/cpu/mpc83xx/start.S +++ b/arch/powerpc/cpu/mpc83xx/start.S @@ -1158,6 +1158,10 @@ map_flash_by_law1: bne 1b stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */ + /* Wait for HW to catch up */ + lwz r4, LBLAWAR1(r3) + twi 0,r4,0 + isync blr /* Though all the LBIU Local Access Windows and LBC Banks will be @@ -1196,5 +1200,9 @@ remap_flash_by_law0: xor r4, r4, r4 stw r4, LBLAWBAR1(r3) stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */ + /* Wait for HW to catch up */ + lwz r4, LBLAWAR1(r3) + twi 0,r4,0 + isync blr #endif /* CONFIG_SYS_FLASHBOOT */ -- cgit v1.2.1