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[Qemu-devel] Re: [PATCH v2 1/6] Use IO port for qemu<->guest BIOScommuni

From: Sebastian Herbszt
Subject: [Qemu-devel] Re: [PATCH v2 1/6] Use IO port for qemu<->guest BIOScommunication.
Date: Mon, 25 Aug 2008 20:53:05 +0200

Jamie Lokier wrote:
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.

Ralf Brown's "Ports List, part 2 of 3" says
"PORT 040A-043F - Intel 82378ZB embedded DMA controller".

- Sebastian

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