From: Chris Samuel <chris@csamuel.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: 2.6.38.3 and 2.6.39-rc4 hangs after "Booting the kernel" on quad Pentium Pro system
Date: Sat, 23 Apr 2011 21:32:10 +1000
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Cc: "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
References: <201104222333.25546.chris@csamuel.org> <20110423103536.1c7ff2a8@lxorguk.ukuu.org.uk> <201104232036.02758.chris@csamuel.org>
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Hi Alan,

On Sat, 23 Apr 2011 08:35:59 PM Chris Samuel wrote:

>   On Sat, 23 Apr 2011 07:35:36 PM Alan Cox wrote:
>
> > Ah.. do you have a BIOS setting called something like OS/2
> > compatibility ?
>=20
> That's the really odd thing, I am yet to find a way to access
> the BIOS settings on this beast. I've tried the usual DEL, F2
> and F1 with no success and there is no prompt I've ever seen
> to offer access to one.  I do have a ZIP file that contains
> the last BIOS upgrade for it that was released so I'll see if
> I can make that bootable and see if that reveals any options.

OK, that ZIP file doesn't have a BIOS but it did have a BIOS
configuration program. I have a "Primary Operating System"
option which is currently:

 UNIX, Novell, Windows NT, OS/2, Other (Multi-Processor)

The alternatives for that option are:

 UNIX, Novell, Windows NT, Others (Single-Processor)
 DOS, OS/2

The README accompanying the ZIP says:

# Due to a PentiumPro bug the BIOS need to know if a Multi-Processor
# or Single Processor Operating System is installed to correctly
# set-up the local APIC and MP table.

The only other options that seem like they might be relevant are:

 Extended Memory Above 64MB Support - Enabled
 Video Shadowing - Shadowed at C000: and C400:

As regards memory it reports:

Base Memory: 640KB
Extended Memory (Contiguous): 255MB
Extended Memory (Non-contiguous): 0KB


Anything ring any bells there ?

cheers,
Chris
=2D-=20
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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