From: "H. Peter Anvin" <hpa@zytor.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
seabios@seabios.org, qemu-devel@nongnu.org
Subject: Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios
Date: Wed, 13 Oct 2010 13:22:25 -0700 [thread overview]
Message-ID: <4CB61501.6090801@zytor.com> (raw)
In-Reply-To: <4CB60FC0.3050201@zytor.com>
On 10/13/2010 01:00 PM, H. Peter Anvin wrote:
> On 10/13/2010 12:17 PM, H. Peter Anvin wrote:
>>
>> The ACPI specification recognizes three interfaces as standard: PC/AT
>> (64 bytes, even though 128 bytes is available on a lot of platforms),
>> PIIX4 (256 bytes), and Dallas Semiconductor ("256 bytes or more"). The
>> interface for the latter isn't well cited in the ACPI spec, but I'm
>> guessing this is referring to the DS17885 series of chips, which can
>> have up to 8K CMOS using a bank-switched scheme which presents 128 bytes
>> at a time (thus accessible via only the standard 70/71 ports.)
>>
>
> FWIW, the DS17885 scheme actually allows addressing up to 64K; 8K is the
> maximum that DS produced with this particular interface as far as I
> know, but there are 16 address bits available.
>
> -hpa
I think this is the relevant application note:
http://www.maxim-ic.com/app-notes/index.mvp/id/77
-hpa
next prev parent reply other threads:[~2010-10-13 20:22 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-11 10:18 [Qemu-devel] [RFC] Passing boot order from qemu to seabios Gleb Natapov
2010-10-11 10:32 ` Kevin Wolf
2010-10-11 10:43 ` Gleb Natapov
2010-10-11 11:01 ` Kevin Wolf
2010-10-11 12:07 ` Gerd Hoffmann
2010-10-11 12:16 ` Gleb Natapov
2010-10-11 19:48 ` [SeaBIOS] " Anthony Liguori
2010-10-11 19:59 ` Gleb Natapov
2010-10-11 20:30 ` Anthony Liguori
2010-10-11 20:36 ` Gleb Natapov
2010-10-11 20:50 ` Anthony Liguori
2010-10-11 21:14 ` Gleb Natapov
2010-10-11 21:15 ` H. Peter Anvin
2010-10-11 21:41 ` Sebastian Herbszt
2010-10-11 21:51 ` H. Peter Anvin
2010-10-12 8:01 ` Gleb Natapov
2010-10-12 16:33 ` H. Peter Anvin
2010-10-12 16:56 ` Gleb Natapov
2010-10-12 17:35 ` H. Peter Anvin
2010-10-12 17:41 ` Gleb Natapov
2010-10-12 17:45 ` H. Peter Anvin
2010-10-12 19:06 ` Gleb Natapov
2010-10-13 19:17 ` H. Peter Anvin
2010-10-13 20:00 ` H. Peter Anvin
2010-10-13 20:22 ` H. Peter Anvin [this message]
2010-10-11 19:51 ` Anthony Liguori
2010-10-11 20:02 ` Gleb Natapov
2010-10-11 20:18 ` [SeaBIOS] " H. Peter Anvin
2010-10-11 11:16 ` Bernhard Kohl
2010-10-11 12:08 ` Gleb Natapov
2010-10-11 23:33 ` [SeaBIOS] " Kevin O'Connor
2010-10-11 12:48 ` Stefan Hajnoczi
2010-10-11 14:29 ` Gleb Natapov
2010-10-11 15:52 ` Stefan Hajnoczi
2010-10-11 16:04 ` Gleb Natapov
2010-10-11 17:01 ` Anthony Liguori
2010-10-11 17:04 ` Gleb Natapov
2010-10-11 23:16 ` [SeaBIOS] " Kevin O'Connor
2010-10-12 8:44 ` Stefan Hajnoczi
2010-10-11 15:09 ` [Qemu-devel] Re: [SeaBIOS] " Avi Kivity
2010-10-11 15:39 ` Gleb Natapov
2010-10-11 15:42 ` Avi Kivity
2010-10-11 15:52 ` Gleb Natapov
2010-10-12 0:08 ` Kevin O'Connor
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