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-rw-r--r--cpu/mpc83xx/start.S18
1 files changed, 15 insertions, 3 deletions
diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S
index beebc99..26e3106 100644
--- a/cpu/mpc83xx/start.S
+++ b/cpu/mpc83xx/start.S
@@ -200,9 +200,23 @@ boot_cold: /* time t 3 */
nop
boot_warm: /* time t 5 */
mfmsr r5 /* save msr contents */
+
+ /* 83xx manuals prescribe a specific sequence for updating IMMRBAR. */
+ bl 1f
+1: mflr r7
+
lis r3, CONFIG_SYS_IMMR@h
ori r3, r3, CONFIG_SYS_IMMR@l
+
+ lwz r6, IMMRBAR(r4)
+ isync
+
stw r3, IMMRBAR(r4)
+ lwz r6, 0(r7) /* Arbitrary external load */
+ isync
+
+ lwz r6, IMMRBAR(r3)
+ isync
/* Initialise the E300 processor core */
/*------------------------------------------*/
@@ -212,9 +226,7 @@ boot_warm: /* time t 5 */
* is loaded. Wait for the rest before branching
* to another flash page.
*/
- addi r7, r3, 0x50b0
-1: dcbi 0, r7
- lwz r6, 0(r7)
+1: lwz r6, 0x50b0(r3)
andi. r6, r6, 1
beq 1b
#endif