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ppc4xx: Fix TLB reset problem with recent 44x images

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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>
This commit is contained in:
Stefan Roese 2009-07-14 15:53:08 +02:00
parent 28958b8bea
commit 0a371ca089
1 changed files with 7 additions and 2 deletions
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9
cpu/ppc4xx/start.S
View file

@ -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 */