lkml.org 
[lkml]   [2003]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: AMD760MPX: bogus chispset ? (was PROBLEM: sound is stutter, sizzle with lasts kernel releases)
Alan Cox wrote:
> On Gwe, 2003-07-11 at 18:02, xi wrote:
>
>>Now I have done some investigations, and I think I have found the
>>problem: It has appeared between kernel-2.4.18-pre9 and kernel-2.4.18-rc1
>>If I am not wrong, between these two versions, Alan Cox did a change in
>>drivers/pci/quirks.c and this is this change which cause the problem.
>
>
> As I read the documentation the other change is also required in this
> situation to avoid a chipset lockup. It might be worth you rechecking
> the AMD errata docs for 762/768 again to be sure I didnt screw up and
> there are not newer rules for other revisions.
>

Ok, I have rechecked the errata docs. I have not found any
recommandation change for PCI compliance configuration registers.

And one interesting thing:
in the AMD762 datasheet (24462.pdf) page 231 (Recommanded BIOS
settings), I can see this: "Numerical Values shown with h or b are
preferred settings." ; and AMD recommand this:
-> set bits 2 and 1 of register 0x4C to "0b"
-> set bits 23 and 3 respectively to "0b" and "1b"

I can confirm that these settings works much more better, even if they
don't exactly follow PCI specs. And I don't think this is specific to my
cards since I have tested others.
Furthermore, my AMD762 is revision B1 (just before the last one: C0),
and my AMD768 revision is B2, the last one.

Would you accept I make a patch which doesn't make any change in these
registers at least up to AMD762 revision B1 (ie keeping recommanded
values from AMD) ?
Or could you propose an other solution ?


Regards,
Xavier

--
E-mail:
ctrl.alt.sup@free.fr xizard@chez.com
Please no longer use xizard@enib.fr, this e-mail will be removed soon.

Homepage:
http://xizard.free.fr
http://www.chez.com/xizard/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:46    [from the cache]
©2003-2011 Jasper Spaans