linux-kernel - Re: Regression: boot failure on AMD Elan TS-5500

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Message-ID: <48696167.6050000@zytor.com>
Date:	Mon, 30 Jun 2008 15:42:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Sean Young <sean@...s.org>, Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: Regression: boot failure on AMD Elan TS-5500

Jeremy Fitzhardinge wrote:
> 
> Maybe it really does require the far jump immediately after setting PE 
> in cr0...
> 
> Hm, I don't remember this paragraph being in vol 3a, section 8.9.1 
> before.  Is it a recent addition?
> 
>    Random failures can occur if other instructions exist between steps
>    3 and 4 above.  Failures will be readily seen in some situations,
>    such as when instructions that reference memory are inserted between
>    steps 3 and 4 while in system management mode.
> 

I don't remember that, either.

Sean: could you try the following patch?

	-hpa

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