* [MPC8xx] Initial MMU too low
@ 2010-10-30 11:52 LEROY christophe
2010-10-30 20:47 ` Benjamin Herrenschmidt
2010-11-01 17:58 ` Scott Wood
0 siblings, 2 replies; 3+ messages in thread
From: LEROY christophe @ 2010-10-30 11:52 UTC (permalink / raw)
To: linuxppc-dev
Hello,
When I build a kernel with DEBUG_LOCK_ALLOC set, I get a kernel which
has __bss_stop above the C0800000 limit, and then I get a bad page
exception during the zeroize of the __bss at startup, because the
initial MMU only maps the first 8Mbytes.
What can I do to fix that ?
Regards
C. Leroy
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [MPC8xx] Initial MMU too low
2010-10-30 11:52 [MPC8xx] Initial MMU too low LEROY christophe
@ 2010-10-30 20:47 ` Benjamin Herrenschmidt
2010-11-01 17:58 ` Scott Wood
1 sibling, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2010-10-30 20:47 UTC (permalink / raw)
To: LEROY christophe; +Cc: linuxppc-dev
On Sat, 2010-10-30 at 13:52 +0200, LEROY christophe wrote:
> Hello,
>
> When I build a kernel with DEBUG_LOCK_ALLOC set, I get a kernel which
> has __bss_stop above the C0800000 limit, and then I get a bad page
> exception during the zeroize of the __bss at startup, because the
> initial MMU only maps the first 8Mbytes.
>
> What can I do to fix that ?
Not much... maybe pin more initial TLBs ?
Ben.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [MPC8xx] Initial MMU too low
2010-10-30 11:52 [MPC8xx] Initial MMU too low LEROY christophe
2010-10-30 20:47 ` Benjamin Herrenschmidt
@ 2010-11-01 17:58 ` Scott Wood
1 sibling, 0 replies; 3+ messages in thread
From: Scott Wood @ 2010-11-01 17:58 UTC (permalink / raw)
To: LEROY christophe; +Cc: linuxppc-dev
On Sat, 30 Oct 2010 13:52:24 +0200
LEROY christophe <christophe.leroy@c-s.fr> wrote:
> Hello,
>
> When I build a kernel with DEBUG_LOCK_ALLOC set, I get a kernel which
> has __bss_stop above the C0800000 limit, and then I get a bad page
> exception during the zeroize of the __bss at startup, because the
> initial MMU only maps the first 8Mbytes.
>
> What can I do to fix that ?
Under "Advanced setup", select "Pinned Kernel TLBs". Ignore the "860
ONLY", it applies to all 8xx.
-Scott
^ permalink raw reply [flat|nested] 3+ messages in thread
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2010-10-30 11:52 [MPC8xx] Initial MMU too low LEROY christophe
2010-10-30 20:47 ` Benjamin Herrenschmidt
2010-11-01 17:58 ` Scott Wood
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