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Re: [Xen-devel] [PATCH] Disable SMP on the MacBook by default

To: gimli <gimli@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] Disable SMP on the MacBook by default
From: Marco Gerards <mgerards@xxxxxxxxx>
Date: Thu, 14 Sep 2006 00:34:27 +0200
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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gimli <gimli@xxxxxxxxxxxxxx> writes:

> Marco Gerards schrieb:
>> "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> writes:
>> [...]
>>>> The SMP issue can be avoided from GRUB when you press the "right
>>>> arrow" key instead of "enter" to boot.  Someone mentioned this on the
>>>> mailinglist, perhaps that is why you mixed up the two?
>>> This does kinda suggest that a further Grub patch might be part of the
>>> solution, no?
>> This is something I looked at, of course.  The GRUB code doesn't make
>> a difference between "right arrow" and return.  Besides that, it
>> doesn't work with the timeout either.
> Hm... The strange thing is, hitting the "Return" key crashed xen every time.
> Using the "Rigth arrow" key made xen bootable evry time from grub. So there 
> must
> be a difference.

What I am thinking about is that it is a difference related to
interrupts or so.  Another thing can be that the Legacy BIOS code has
a bug.  There is another known bug in this code already related to
keyboard handling.  But this is all speculation.  There is nothing in
GRUB that even remotely looks like something that can cause such a


>> When I was installing Ubuntu for the first time on the MacBook, it
>> tried installing GRUB and failed.  First I tried lilo which worked.
>> Later I started using GRUB.  I haven't seen ELILO being used anywhere.
> I use the patched grub and elilo.

Right, otherwise it will not work at all.


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