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Bug 200549 - [olpc] i586 kernel panics on boot on AMD Geode
Summary: [olpc] i586 kernel panics on boot on AMD Geode
Alias: None
Product: Fedora
Classification: Fedora
Component: binutils
Version: rawhide
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact:
: 200037 (view as bug list)
Depends On:
Blocks: FC6Target FC6Blocker OLPCBlocker OLPCTracker
TreeView+ depends on / blocked
Reported: 2006-07-28 16:28 UTC by David Zeuthen
Modified: 2013-03-06 03:46 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-08-01 23:29:35 UTC

Attachments (Terms of Use)
photograph of panic (deleted)
2006-07-28 16:28 UTC, David Zeuthen
no flags Details

Description David Zeuthen 2006-07-28 16:28:37 UTC
Description of problem:

panic right after boot - I think even before the initramfs is started. Will
attach screenshot.

Version-Release number of selected component (if applicable):


How reproducible:

Always on AMD Geode. It's really bad as we need to move off the i686 kernel (see
bug 200330 and bug 200409) as the AMD geode is not fully i686 compatible and the
recent binutils started producing code where this is exposed. So right now we're
kind of screwed. Please advise. Thanks!

Comment 1 David Zeuthen 2006-07-28 16:28:39 UTC
Created attachment 133245 [details]
photograph of panic

Comment 2 Dave Jones 2006-07-28 16:49:27 UTC
*** Bug 200037 has been marked as a duplicate of this bug. ***

Comment 3 Dave Jones 2006-07-28 17:18:23 UTC
Ok, this looks like binutils breakage to me. hj 'optimised' the NOP handling for
686, but seems to have busted 586 in the process.

66 0f 1f is not valid on i586 (and possibly some 686s afair).

Comment 4 Dave Jones 2006-07-28 17:31:20 UTC states ...

The multi-byte form of NOP is available on processors with model encoding:
⢠  CPUID.01H.EAX[Bytes 11:8] = 0110B or 1111B

So, only family 6 and 15. Little wonder 586 is hurting.

Comment 5 Dave Jones 2006-07-28 17:42:51 UTC
note btw, that this statement does nothing to guarantee that the right thing
happens with that code sequence on for eg, athlons, VIA-C3, or any other
non-intel 686.  It seems Intel only recently started documenting the multi-byte
variants of NOP, so any vendors that based their own 686 implementation on
reading (older) intel docs may be in for a surprise.

Comment 6 Christopher Blizzard 2006-07-28 19:38:59 UTC
So what's the plan to fix things here?  Unscrew binutils?  In our example it
would be great if we can compile somewhere else (for i686) and it still runs on
the geode.  Is upstream binutils actually broken in this case?

Comment 7 H.J. Lu 2006-07-28 22:50:52 UTC
Can you try this patch

Comment 8 Christopher Blizzard 2006-08-01 22:58:05 UTC
Sounds like we have a working kernel after a rebuild with binutils and this
patch.  David, are we good to close?

Comment 9 David Zeuthen 2006-08-01 23:29:35 UTC
Yup, the i686 kernel works on the Geode. Closing bug. Thanks to everyone involved!

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