linux-kernel - Re: [PATCH] x86: set Pentium M as PAE capable

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Message-ID: <20140226164433.GA19341@srcf.ucam.org>
Date:	Wed, 26 Feb 2014 16:44:33 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Chris Bainbridge <chris.bainbridge@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, davej@...hat.com, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: set Pentium M as PAE capable

On Wed, Feb 26, 2014 at 07:12:59PM +0700, Chris Bainbridge wrote:

> The basic findings of the bug discussion is that people are successfully
> running PAE kernels on Pentium M (for some unknown reason Grub skips the
> validate_cpu code in the kernel, so existing PAE kernels will run
> unmodified, although they do fail when booted with syslinux), and people
> are using a user-space hack to add "pae" to /proc/cpuinfo.

grub is jumping to the 32-bit entry point and skipping the entire real 
mode setup code. Bad grub.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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