Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi_table.

[Justin P. Mattock]

On 06/02/2010 07:15 PM, Justin P. Mattock wrote:
> On 06/02/2010 06:47 PM, Robert Hancock wrote:
> > On Wed, Jun 2, 2010 at 7:37 PM, Matthew Garrett<mjg59@xxxxxxxxxxxxx>
> > wrote:
> > > On Wed, Jun 02, 2010 at 05:27:22PM -0700, Justin P. Mattock wrote:
> > > > On 06/02/2010 05:20 PM, Robert Hancock wrote:
> > > > > #include<unistd.h>
> > > > >
> > > > > int main() {
> > > > > iopl(3);
> > > > > outb(2, 0xcf9);
> > > > > sleep(1);
> > > > > outb(6, 0xcf9);
> > > > > return 0;
> > > > > }
> > > > >
> > > > > That's basically what PCI reboot does.
> > > >
> > > > the above code reboot's the machine as it should..
> > > > I can look at that(need to take a break first though)
> > > > and see..
> > >
> > > That's pretty infuriating. The ACPI-provided definition doesn't work,
> > > and there's no ACPI mechanism for expressing the more complex cf9
> > > behaviour. Windows doesn't appear to special case this, so we're
> > > probably left trying to figure out why the keyboard controller method
> > > doesn't work. Sigh.
> >
> > Do these Macs even have a PC keyboard controller? A recent thread on
> > PS/2 keyboard/mouse controller probing suggests they may not..
> >
> > Justin, what happens if you try the simple outb(6, 0xcf9) test program
> > multiple times, does that do anything?
>
>
> as soon as I change:
>
> int main() {
> iopl(3);
> outb(6, 0xcf9);
> usleep(100);
> outb(6, 0xcf9);
> return 0;
> }
> (the above gave a command prompt
> with numerous tries)
> to:
>
> int main() {
> iopl(3);
> outb(2, 0xcf9);
> usleep(100);
> outb(6, 0xcf9);
> return 0;
> }
>
> it worked..(on the first try)

just rebooted, and tried the one that worked,
had no response(just a command prompt) even though
it rebooted the system prior too.

> but still am confused as
> to why I tried: outb(2, 0xcf9);
> with nothing happening.
> (Maybe something in there
> is changing each boot or something.)

something is changing in there it seems.

Justin P. Mattock

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