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authorStefan Roese <sr@denx.de>2009-07-14 15:53:08 +0200
committerStefan Roese <sr@denx.de>2009-07-24 06:42:31 +0200
commit0a371ca08908c9b2a58171223a79bffea1f7c6f5 (patch)
tree7103baa810540f83e11850cfa21376f77c7c923f /cpu/ppc4xx/start.S
parent28958b8bea4c66629c5a22fd3c8b0d49df90383d (diff)
ppc4xx: Fix TLB reset problem with recent 44x images
Patch d873133f [ppc4xx: Add Sequoia RAM-booting target] broke "normal" booting on some 44x platforms. This breakage is only noticed in some cases while powercycling. As it seems, the code in question in start.S didn't invalidate TLB #0. This makes sense since this TLB is used for the bootrom mapping. With the patch mentioned above even TLB #0 got invalidated resulting in an error later on. This patch now fixes this issue by only invalidating TLB #0 in the RAM- booting case. Tested succesfully on Sequoia and Canyonlands. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Dirk Eibach <Eibach@gdsys.de>
Diffstat (limited to 'cpu/ppc4xx/start.S')
-rw-r--r--cpu/ppc4xx/start.S9
1 files changed, 7 insertions, 2 deletions
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index 582c781cac..2f06914216 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -450,9 +450,14 @@ skip_debug_init:
/* Clear all TLB entries -- TID = 0, TS = 0 */
/*----------------------------------------------------------------*/
addis r0,0,0x0000
- li r1,0x003f /* 64 TLB entries */
- mtctr r1
+#ifdef CONFIG_SYS_RAMBOOT
li r4,0 /* Start with TLB #0 */
+#else
+ li r4,1 /* Start with TLB #1 */
+#endif
+ li r1,64 /* 64 TLB entries */
+ sub r1,r1,r4 /* calculate last TLB # */
+ mtctr r1
rsttlb:
#ifdef CONFIG_SYS_RAMBOOT
tlbre r3,r4,0 /* Read contents from TLB word #0 to get EPN */