Subject: Re: ISA DMA take 2

From: Adrian Cox <[email-masked]>
Date: Wed, 09 Jan 2002 17:40:33 +0000

Michael Sokolov wrote:

> What's your memory map? Do you put the bottom 16 MB of main memory in the
> bottom 16 MB of the PCI memory space on the PCI segment with the Via without an
> I/O hole?

Yes - and I set ISA_DMA_THRESHOLD to 0x00ffffff. It's not possible to
use ISA DMA with the Via southbridge unless you have main memory at 0x0
on the PCI bus.

Of course, if anybody knows a cheap southbridge with 32-bit ISA DMA,
UDMA100, and maybe USB, it would be nice to hear of it for future boards.

--
Adrian Cox   http://www.humboldt.co.uk/

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