linux-kernel - Re: Math-emu kills the kernel on Athlon64 X2

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Message-ID: <9a8748490609181702r6a6bac4et560081e2a25adc1f@mail.gmail.com>
Date:	Tue, 19 Sep 2006 02:02:48 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	sergio@...giomb.no-ip.org
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	billm@...bpc.org.au, billm@...urbia.net
Subject: Re: Math-emu kills the kernel on Athlon64 X2

On 19/09/06, Sergio Monteiro Basto <sergio@...giomb.no-ip.org> wrote:
> On Tue, 2006-09-19 at 00:18 +0200, Jesper Juhl wrote:
> > Hi,
> >
> > If I enable the math emulator in 2.6.18-rc7-git2 (only version I've
> > tried this with) and then boot the kernel with "no387" then I only get
> > as far as lilo's "...Booting the kernel." message and then the system
> > hangs.
> >
>
> I think, math emulation is for 486 and older. 486 DX2 was the first one
> who have math co processor, on earlier processor it should be disable .
>
Yes, it's mainly there for CPU's that don't have a math co-processor,
but it's also there for the cases where the math co-processor is
broken or where for some other reason you may not want to use it - so
it really should work...  Sure, it may be slow as hell compared to
hardware, but if it's there and I can select it then it should at
least be functional.


-- 
Jesper Juhl <jesper.juhl@...il.com>
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