linux-kernel - Re: [PATCH] Make Intel 8-way Xeons boot again

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Message-Id: <1263330474.2854.548.camel@sbs-t61.sc.intel.com>
Date:	Tue, 12 Jan 2010 13:07:54 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH] Make Intel 8-way Xeons boot again

On Tue, 2010-01-12 at 13:02 -0800, H. Peter Anvin wrote:
> On 01/12/2010 12:20 PM, Suresh Siddha wrote:
> > On Tue, 2010-01-12 at 11:10 -0800, Yinghai Lu wrote:
> >> if the system can not use logical flat.
> >>
> >> should have some bit set in FADT...
> > 
> > Yinghai, Sorry. I am not sure what you are referring to here. I have
> > mentioned about FADT in another thread, so not sure what you mean by
> > this here.
> > 
> > Are you referring that bios for the IBM system can use this to fix their
> > problem? Once we understand what the problem is with IBM platform, then
> > we can propose a solution (using FADT perhaps) that is acceptable to
> > everyone.
> > 
> 
> Does the IBM platform set this bit in FADT?

No. If they had set it, kernel would have used physical mode and
wouldn't have seen this issue.

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