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

From: Robert Hancock
Date: Wed Jun 02 2010 - 22:05:36 EST


On Wed, Jun 2, 2010 at 8:00 PM, Justin P. Mattock
<justinmattock@xxxxxxxxx> 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?
>>
>
>
> this reboots the system
>
>
> int main() {
>           iopl(3);
>           outb(6, 0xcf9);
>           return 0;
> }

On a single try, or multiple times? (You tried that one before once
and it didn't work, right?)
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