linux-kernel - kernel won't boot on a Cyrix MediaGXm (Geode )

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Message-ID: <48841A92.4020301@sieb.net>
Date:	Sun, 20 Jul 2008 22:11:46 -0700
From:	Samuel Sieb <samuel@...b.net>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: kernel won't boot on a Cyrix MediaGXm (Geode )

I have a computer here with a CPU that the BIOS identifies as:
Cyrix MediaGXm/Cx5530 Unicorn Revision 1.19.3B

kernel 2.6.14 identifies it as:
vendor_id	: Geode by NSC
cpu family	: 5
model		: 9
model name	: Geode(TM) Integrated Processor by National Semi
stepping	: 1

I can't boot any kernel later than 2.6.22 on it.  Anything later either 
hangs or gives random kernel panics while booting.  I tracked down the 
problem to a specific commit:

commit f25f64ed5bd3c2932493681bdfdb483ea707da0a
Author: Juergen Beisert <juergen@...uzholzen.de>
Date:   Sun Jul 22 11:12:38 2007 +0200

     x86: Replace NSC/Cyrix specific chipset access macros by inlined 
functions.

Reversing the patch (compensating for kernel changes) let me boot a 
2.6.25 kernel.  I realize the patch is supposed to fix something that 
didn't work right, but I didn't have a problem before and I do now. :-)
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