diff mbox

Linux kernel 3.x problems on PowerMac G5

Message ID 513C6641.2010308@mail.ru (mailing list archive)
State Accepted, archived
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Commit Message

Phileas Fogg March 10, 2013, 10:53 a.m. UTC 
Good news :) I found the bug.
MMU features were not set properly for PPC970MP DD1.0 which,
unfortunately, my machine has.
Damn, one line fix but one week searching.
Linux 3.8.2 boots without problems now :)


Here is my patch:




Regards

Comments

Benjamin Herrenschmidt March 10, 2013, 12:52 p.m. UTC | #1 
On Sun, 2013-03-10 at 11:53 +0100, Phileas Fogg wrote:
> Good news :) I found the bug.
> MMU features were not set properly for PPC970MP DD1.0 which,
> unfortunately, my machine has.
> Damn, one line fix but one week searching.
> Linux 3.8.2 boots without problems now :)

Nice one ! I didn't think anybody shipped a DD1.0 chip ! :-)

Looks like some typo/thinko in the cputable and you are one of the very
rare victims of it. I'll fix that up. Regarding the IDE problem, can you
shoot a note to Tejun who wrote that patch (and CC me) ? I do recommend
switching to libata but we should still fix the problem with legacy IDE.

Cheers,
Ben.
Phileas Fogg March 11, 2013, 7:31 p.m. UTC | #2 
On 03/10/2013 01:52 PM, Benjamin Herrenschmidt wrote:
> On Sun, 2013-03-10 at 11:53 +0100, Phileas Fogg wrote:
>> Good news :) I found the bug.
>> MMU features were not set properly for PPC970MP DD1.0 which,
>> unfortunately, my machine has.
>> Damn, one line fix but one week searching.
>> Linux 3.8.2 boots without problems now :)
>
> Nice one ! I didn't think anybody shipped a DD1.0 chip ! :-)
>
> Looks like some typo/thinko in the cputable and you are one of the very
> rare victims of it. I'll fix that up. Regarding the IDE problem, can you
> shoot a note to Tejun who wrote that patch (and CC me) ? I do recommend
> switching to libata but we should still fix the problem with legacy IDE.
>
> Cheers,
> Ben.
>
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>

The IDE-CD bug appears to be already fixed. I tested g5_defconfig with 
Linux 3.8.2 and it boots OK. I think i saw a commit regarding this issue 
in git.

Regards
diff mbox

Patch

--- arch/powerpc/kernel/cputable.c.old	2013-03-10 11:48:56.559480758 +0100
+++ arch/powerpc/kernel/cputable.c	2013-03-10 11:41:07.522786804 +0100
@@ -275,7 +275,7 @@ 
  		.cpu_features		= CPU_FTRS_PPC970,
  		.cpu_user_features	= COMMON_USER_POWER4 |
  			PPC_FEATURE_HAS_ALTIVEC_COMP,
-		.mmu_features		= MMU_FTR_HPTE_TABLE,
+		.mmu_features		= MMU_FTRS_PPC970,
  		.icache_bsize		= 128,
  		.dcache_bsize		= 128,
  		.num_pmcs		= 8,