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

[Robert Hancock]

On 06/02/2010 06:27 PM, Justin P. Mattock wrote:
> On 06/02/2010 05:20 PM, Robert Hancock wrote:
> > On Wed, Jun 2, 2010 at 6:05 PM, Justin P. Mattock
> > <justinmattock@xxxxxxxxx> wrote:
> > > > > > Hmm, so the FADT says the reset register is listed as supported, and
> > > > > > says writing 0x06 to 0xCF9 is supposed to do it.. That's exactly what
> > > > > > this should do:
> > > > > >
> > > > > > #include<sys/io.h>
> > > > > >
> > > > > > int main() {
> > > > > > iopl(3);
> > > > > > outb(6, 0xcf9);
> > > > > > return 0;
> > > > > > }
> > > > > >
> > > > > > but you said that didn't do anything.. It kind of seems like ACPI
> > > > > > reboot is busted on this machine then, but then I wonder how Windows
> > > > > > manages to work..
> > > > >
> > > > >
> > > > > alright!! I have a better idea at what this is now..
> > > > > as for the above code, yes this one segfaults,
> > > > > the other code posted on the thread just returns
> > > > > a command prompt(testing:
> > > >
> > > > You get a segfault on that one? Running as root?
> > >
> > > my bad(tired)I left out iopl(3);
> > > in the code which was giving a segfault.
> > >
> > > running the below code(s) just gives a command prompt
> > >
> > > int main() {
> > > iopl(3);
> > > outb(0xfe, 0xcf9);
> > > return 0;
> > > }
> > >
> > > int main() {
> > > iopl(3);
> > > outb(6, 0xcf9);
> > > return 0;
> > > }
> >
> > What if you do:
> >
> > #include<unistd.h>
> >
> > int main() {
> > iopl(3);
> > outb(2, 0xcf9);
> > sleep(1);
> > outb(6, 0xcf9);
> > return 0;
> > }
> >
> > That's basically what PCI reboot does.
> >
> > It's possible it doesn't take the first time - you could try modifying
> > drivers/acpi/reboot.c to call acpi_reset in a loop instead of just
> > trying once (assuming you have the patch to default to ACPI reboot
> > enabled).
>
> the above code reboot's the machine as it should..
> I can look at that(need to take a break first though)
> and see..
>
> what about the whole kbd mechanism(0x64) give the info I provided
> does it look possible, or is this machine strictly on cf9?

The keyboard controller reset is the kernel default, so I assume that 
doesn't work on this machine or else this wouldn't have come up in the 
first place..
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