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Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios
From: |
H. Peter Anvin |
Subject: |
Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios |
Date: |
Wed, 13 Oct 2010 13:00:00 -0700 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100921 Fedora/3.1.4-1.fc13 Thunderbird/3.1.4 |
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
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, (continued)
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Gleb Natapov, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, H. Peter Anvin, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Gleb Natapov, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, H. Peter Anvin, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Gleb Natapov, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, H. Peter Anvin, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Gleb Natapov, 2010/10/12
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, H. Peter Anvin, 2010/10/13
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios,
H. Peter Anvin <=
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, H. Peter Anvin, 2010/10/13
- Re: [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Anthony Liguori, 2010/10/11
- Re: [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Gleb Natapov, 2010/10/11
- Re: [SeaBIOS] [Qemu-devel] [RFC] Passing boot order from qemu to seabios, H. Peter Anvin, 2010/10/11
Re: [Qemu-devel] [RFC] Passing boot order from qemu to seabios, Bernhard Kohl, 2010/10/11