From: msokolov@ivan.Harhan.ORG (Michael Sokolov)
To: linuxppc-dev@lists.linuxppc.org
Subject: Re: ISA DMA take 2
Date: Wed, 9 Jan 02 09:53:06 PST [thread overview]
Message-ID: <0201091753.AA22414@ivan.Harhan.ORG> (raw)
Adrian Cox <adrian@humboldt.co.uk> wrote:
> 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.
As I understand it, you also have to have no I/O hole in the mapping of the
bottom 16 MB of memory onto PCI, right? As I understand it, Linux/PPC is a sane
PPC OS and treats all PPC memory as normal, without any special treatment for
0xA0000-0xFFFFF, so your DMA buffer could legitimately end up in that region
and if your memory map has an I/O hole you would be screwed, right? And of
course main memory on PCI at 0 with no I/O hole means you can't have video on
the same PCI bus... !@#$ing pee sea legacy :(
MS
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next reply other threads:[~2002-01-09 17:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-09 17:53 Michael Sokolov [this message]
2002-01-09 18:27 ` ISA DMA take 2 Adrian Cox
-- strict thread matches above, loose matches on Subject: below --
2002-01-09 20:18 Michael Sokolov
2002-01-09 20:43 ` Adrian Cox
2002-01-09 17:21 Michael Sokolov
2002-01-09 17:40 ` Adrian Cox
2002-01-08 15:33 Adrian Cox
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