Re: [PATCH 1/3] X86: Revamp reboot behaviour to match Windows moreclosely

[H. Peter Anvin]

On 12/09/2010 02:32 PM, Matthew Garrett wrote:
> On Thu, Dec 09, 2010 at 02:25:05PM -0800, H. Peter Anvin wrote:
> > On 12/09/2010 01:46 PM, Matthew Garrett wrote:
> > > Windows reboots by hitting the ACPI reboot vector (if available), trying
> > > the keyboard controller, hitting the ACPI reboot vector again and then
> > > giving the keyboard controller one last go. Rework our reboot process a
> > > little to default to matching this behaviour, although we'll fall through
> > > to attempting a triple fault if nothing else works.
> > >
> > > Signed-off-by: Matthew Garrett<mjg@xxxxxxxxxx>
> >
> > When this was discussed before we agreed to use ACPI reboot by default
> > with an ACPI cutoff date; this doesn't have any such cutoff.
>
> Windows doesn't either. Older machines simply won't have the appropriate
> flag set in their FADT.

Windows doesn't get validated on old hardware.

	-hpa

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