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xen-devel
Re: [Xen-devel] [patch]Add a new reboot method
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To: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [patch]Add a new reboot method |
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From: |
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> |
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Date: |
Thu, 29 May 2008 15:59:26 +0100 |
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Cc: |
Huacai Chen <huacai.chen@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxxxx> |
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Thu, 29 May 2008 08:13:50 -0700 |
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On Thu, 29 May 2008 14:30:04 +0100
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> On 29/5/08 14:09, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:
>
> >> You might want to boot a 32bit kernel and try acpi=off, if that does the
> >> trick then its (another) ACPI bug and the cf9 is red herring ?
> >
> > As Keir also pointed out, there's no ACPI involved in rebooting. I also
> > did verify (in a 32-bit kernel) that it's the keyboard boot sequence that
> > causes the machine to hang.
>
> ACPI *can* be involved in rebooting though, via FADT's RESET_REGISTER.
> Question is: why does Linux ignore this reboot method?
It doesn't. Well at the least upstream version doesn't. We default to
keyboard currently but that probably wants reconsidering for modern
systems.
Alan
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