linux-kernel - Re: 2.6.39-rc5-git2 boot crashs

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Message-ID: <20110503205051.GA28647@elte.hu>
Date:	Tue, 3 May 2011 22:50:51 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	werner <w.landgraf@...ru>, Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.39-rc5-git2 boot crashs


* H. Peter Anvin <hpa@...or.com> wrote:

> On 05/03/2011 01:17 PM, Linus Torvalds wrote:
> > 
> > That said, I don't really see why ELAN would be so special.
> > 
> 
> ELAN used to have a nonstandard A20 enabling sequence, until someone
> found out that changes to the mainline sequence had made ELAN work as a
> side effect.
> 
> At this point, it's just a CPU selection thing, so it makes very little
> sense.

the ELAN .config option influences the following details:

 - sets X86_L1_CACHE_SHIFT to 4 (16 bytes) instead of the typical 6 (64 bytes)
 - sets X86_ALIGNMENT_16
 - sets the -march=i486 compiler flag

So in terms of the kernel image it seems to be mostly equivalent to selecting 
i486 from the CPU menu - except the X86_ALIGNMENT_16 detail (which does not 
seem to do anything substantive, AFAICS).

Thanks,

	Ingo
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