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Date: Tue, 26 Aug 2008 11:17:55 +0300
From: Gleb Natapov <gleb@qumranet.com>
Subject: Re: [Qemu-devel] Re: [PATCH v2 1/6] Use IO port for qemu<->guest
	BIOScommunication.
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To: qemu-devel@nongnu.org

On Mon, Aug 25, 2008 at 08:53:05PM +0200, Sebastian Herbszt wrote:
> 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".
>
It lists ports 0x401/0x403 as part of EISA DMA Controller, but they are
used by qemu for BIOS debug. What about port 0x510? It is not listed
there (but on my desktop 0x500-0x53f are used by ISA bridge 82801IH).
Perhaps choose some high port (0x6666 for instance)?

--
			Gleb.