linux-kernel - Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi

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Date:	Wed, 02 Jun 2010 19:15:36 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, x86@...nel.org,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi_table.

On 06/02/2010 06:47 PM, Robert Hancock wrote:
> On Wed, Jun 2, 2010 at 7:37 PM, Matthew Garrett<mjg59@...f.ucam.org>  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)

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.)

Justin P. Mattock

Justin P. Mattock
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