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

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Date:	Wed, 2 Jun 2010 17:18:19 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	"Justin P. Mattock" <justinmattock@...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 Wed, Jun 2, 2010 at 12:01 AM, Justin P. Mattock
<justinmattock@...il.com> wrote:
>> Can you post the FACP section of the acpidump output from this machine?
>>
>
> here you go:
>


>             Reset Register Supported (V2) : 1

> [074h 116 12]               Reset Register : <Generic Address Structure>
> [074h 116  1]                     Space ID : 01 (SystemIO)
> [075h 117  1]                    Bit Width : 08
> [076h 118  1]                   Bit Offset : 00
> [077h 119  1]                 Access Width : 00
> [078h 120  8]                      Address : 0000000000000CF9
>
> [080h 128  1]         Value to cause reset : 06

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..
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