linux-kernel - FPU emulation broken in 2.6.28-rc8 ?

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Message-ID: <20081217085620.GA20184@bitwizard.nl>
Date:	Wed, 17 Dec 2008 09:56:20 +0100
From:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
To:	linux-kernel@...r.kernel.org
Subject: FPU emulation broken in 2.6.28-rc8 ?

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. 

-- 
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