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From: Rogier Wolff <R.E.Wolff@BitWizard.nl>
To: linux-kernel@vger.kernel.org
Subject: FPU emulation broken in 2.6.28-rc8 ?
Date: Wed, 17 Dec 2008 09:56:20 +0100	[thread overview]
Message-ID: <20081217085620.GA20184@bitwizard.nl> (raw)


Hi,

I'm getting messages similar to: 

FPU emulator: unknown prefix byte 0x00,
FPU emulator: probably due to self-modifying code (emulation impossible)
FPU ........: internal error type 0x0126
At 00000017:0000
 SW: b=1 st=0 es=1 sf=1 cc=0010 ef=111111
 CW: ic=0 rc=00 pc=11 ien=0     ef=111111


(I cut-pasted the above from something I found on google, relating
to 2.4.7, where the FPU emulator was fixedin 2.4.8. 
In my case "internal error" was 126, just like in '2001, In
my case I have "at 17:0", wwhereas in '01 it was reported "at
23:206". And the formatting changed a bit, which I corrected. 
I don't have all the different flags available. If this doesn't
provide enough hints, I'll have to figure those out fro you again.

I'm trying to set up a thin client, which runs on a geode, which
apparently doesn't have a FPU.... (/proc/cpuinfo mentions the flag 
"fpu", what does THAT mean?)

Oh, it seems as if some "state" is involved. booting init=/bin/bash
works, but allowing the system to boot a bit further leads to the
login shell (/bin/bash) getting killed due to the FPU emulator 
problem.... 

	Roger. 

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
**    Delftechpark 26 2628 XH  Delft, The Netherlands. KVK: 27239233    **
*-- BitWizard writes Linux device drivers for any device you may have! --*
Q: It doesn't work. A: Look buddy, doesn't work is an ambiguous statement. 
Does it sit on the couch all day? Is it unemployed? Please be specific! 
Define 'it' and what it isn't doing. --------- Adapted from lxrbot FAQ

             reply	other threads:[~2008-12-17  9:03 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-17  8:56 Rogier Wolff [this message]
2008-12-17 20:32 ` FPU emulation broken in 2.6.28-rc8 ? Rogier Wolff
2008-12-17 22:45   ` Andi Kleen
2008-12-17 22:52     ` Rogier Wolff
2008-12-17 23:20       ` Jesper Juhl
2008-12-17 23:33       ` Andi Kleen
2008-12-18  8:19         ` Rogier Wolff

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