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Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS commun
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication. |
Date: |
Mon, 25 Aug 2008 16:37:44 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Gleb Natapov wrote:
> >> +#define BIOS_CFG_IOPORT 0x1234
> >>
> >
> > I don't think this is a very safe IO port to use. Avi suggested that we
> > advertise the IO port that we use as reserved in the ACPI tables.
> >
> The port number here is just place holder. Any idea of what port we
> should use are welcome. ACPI changes should go into bochs tree and not
> included in this series.
>
> > I would have chosen something in the low 400/500 range since Bochs is
> > already using this range for debugging.
> >
> What about 410?
Whatever port is chosen, it should be one which common and rare
operating systems, recent and ancient, don't "probe" to look for
non-PNP ISA devices - unless the protocol requires a magic sequence to
be woken (and goes back to sleep following a CPU reset).
I quick Google suggests 0x410 is most commonly used by PCMCIA ethernet
cards. I've no idea if they are probed using that port.
-- Jamie
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., (continued)
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Gleb Natapov, 2008/08/26
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Blue Swirl, 2008/08/26
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Avi Kivity, 2008/08/26
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Blue Swirl, 2008/08/26
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Avi Kivity, 2008/08/27
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Gleb Natapov, 2008/08/27
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Blue Swirl, 2008/08/27
- Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Gleb Natapov, 2008/08/28
Re: [Qemu-devel] [PATCH v2 1/6] Use IO port for qemu<->guest BIOS communication., Anthony Liguori, 2008/08/25
[Qemu-devel] [PATCH v2 2/6] Add -uuid command line option., Gleb Natapov, 2008/08/25
[Qemu-devel] [PATCH v2 3/6] Add "info uuid" command to monitor., Gleb Natapov, 2008/08/25
[Qemu-devel] [PATCH v2 5/6] Add UUID to BIOS configuration info., Gleb Natapov, 2008/08/25
[Qemu-devel] [PATCH v2 4/6] Use libuuid if available., Gleb Natapov, 2008/08/25