From: Adrian Cox <adrian@humboldt.co.uk>
To: linuxppc-dev@lists.linuxppc.org
Subject: Re: ISA DMA take 2
Date: Wed, 09 Jan 2002 20:43:34 +0000 [thread overview]
Message-ID: <3C3CAB76.5050703@humboldt.co.uk> (raw)
In-Reply-To: 0201092018.AA22752@ivan.Harhan.ORG
Michael Sokolov wrote:
> Adrian Cox <adrian@humboldt.co.uk> wrote:
>>I have two CT69030 VGA chips on the same PCI bus, but I only enable
>>their PCI memory mapped regions, and never use the legacy VGA addresses.
>
> Ahh, I didn't know you could disable legacy VGA address decoding.
You don't need to. You just have to make sure that no legacy VGA address
ever appears on the PCI bus for the device to respond to.
This is quite easy - references by the PowerPC to addresses 0xa0000 to
0xfffff will go to RAM, not to PCI. If buffers for bus-mastering
peripherals are never allocated in that range, then those addresses will
never appear on the PCI bus.
--
Adrian Cox http://www.humboldt.co.uk/
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-01-09 20:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-09 20:18 ISA DMA take 2 Michael Sokolov
2002-01-09 20:43 ` Adrian Cox [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-01-09 17:53 Michael Sokolov
2002-01-09 18:27 ` Adrian Cox
2002-01-09 17:21 Michael Sokolov
2002-01-09 17:40 ` Adrian Cox
2002-01-08 15:33 Adrian Cox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3C3CAB76.5050703@humboldt.co.uk \
--to=adrian@humboldt.co.uk \
--cc=linuxppc-dev@lists.linuxppc.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).