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Date: Wed, 2 Jun 2010 17:18:19 -0600
Message-ID: <AANLkTinyxtHQrsgvV0CMQZnyEelVnrpCTM05PLAj-ZYx@mail.gmail.com>
Subject: Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi_table.
From: Robert Hancock <hancockrwd@gmail.com>
To: "Justin P. Mattock" <justinmattock@gmail.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>, x86@kernel.org, tglx@linutronix.de,
       linux-kernel@vger.kernel.org
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On Wed, Jun 2, 2010 at 12:01 AM, Justin P. Mattock
<justinmattock@gmail.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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