From: Jamie Lokier <jamie@shareable.org>
To: Blue Swirl <blauwirbel@gmail.com>
Cc: Robert Reif <reif@earthlink.net>,
Paul Brook <paul@codesourcery.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] 64 bit I/O support v7
Date: Tue, 5 May 2009 02:59:28 +0100 [thread overview]
Message-ID: <20090505015928.GE12731@shareable.org> (raw)
In-Reply-To: <f43fc5580905020823l240871b0wa4d6be2d2be121c@mail.gmail.com>
Blue Swirl wrote:
> - Small writes cause a read-modify-write cycle, but I think that may
> happen with real devices too. Another solution is to write zero in
> other byte lanes without reading.
On PCI and I think most buses, there are separate byte-enable pins for
writing each byte lane and the hardware can decide to ignore the
unenabled bytes or not.
-- Jamie
next prev parent reply other threads:[~2009-05-05 1:59 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-21 11:42 [Qemu-devel] [PATCH] 64 bit I/O support v7 Robert Reif
2009-05-01 12:03 ` Paul Brook
2009-05-01 13:46 ` Robert Reif
2009-05-01 14:14 ` Paul Brook
2009-05-01 14:39 ` Robert Reif
2009-05-01 14:52 ` Paul Brook
2009-05-01 15:19 ` Robert Reif
2009-05-01 15:33 ` Paul Brook
2009-05-01 15:51 ` Blue Swirl
2009-05-01 16:36 ` Edgar E. Iglesias
2009-05-01 17:29 ` Robert Reif
2009-05-02 0:02 ` Robert Reif
2009-05-02 0:40 ` Paul Brook
2009-05-01 23:42 ` Robert Reif
2009-05-01 23:57 ` Paul Brook
2009-05-02 15:23 ` Blue Swirl
2009-05-02 19:35 ` Paul Brook
2009-05-05 1:59 ` Jamie Lokier [this message]
2009-05-05 6:05 ` Edgar E. Iglesias
2009-05-01 14:25 ` Robert Reif
2009-05-01 14:39 ` Paul Brook
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=20090505015928.GE12731@shareable.org \
--to=jamie@shareable.org \
--cc=blauwirbel@gmail.com \
--cc=paul@codesourcery.com \
--cc=qemu-devel@nongnu.org \
--cc=reif@earthlink.net \
/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).