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

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Date:	Wed, 02 Jun 2010 19:06:14 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Robert Hancock <hancockrwd@...il.com>, 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 06:56 PM, Matthew Garrett wrote:
> On Wed, Jun 02, 2010 at 07:47:17PM -0600, Robert Hancock wrote:
>> On Wed, Jun 2, 2010 at 7:37 PM, Matthew Garrett<mjg59@...f.ucam.org>  wrote:
>>> 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..
>
> Possibly an SMM trap...
>
>> Justin, what happens if you try the simple outb(6, 0xcf9) test program
>> multiple times, does that do anything?
>
> Huh. That might work, yes. Windows does the ACPI write, an i8042 write,
> the ACPI write, another i8042 write and then gives up. If that happens
> sufficiently quickly, this might get us somewhere. Justin, can you try:
>
> #include<sys/io.h>
> #include<unistd.h>
>
> int main() {
> 	iopl(3);
> 	outb(6, 0xcf9);
> 	usleep(100);
> 	outb(6, 0xcf9);
> 	return 0;
> }
>
> and see if that reboots?
>


this thing is wacked out
this just rebooted the system:

int main() {
            iopl(3);
            outb(6, 0xcf9);
            return 0;
}

and now it's motionless
(just a command prompt).

Justin P. Mattock
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