From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Assorted bugs in the PIIX drivers
Date: Mon, 15 May 2006 19:12:20 +0400 [thread overview]
Message-ID: <44689A54.4020307@ru.mvista.com> (raw)
In-Reply-To: <1132929808.3298.18.camel@localhost.localdomain>
Hello.
Alan Cox wrote:
> I finally got all the documents rounded up to try and redo Jgarzik's
> PIIX driver a bit more completely (I'm short MPIIX if anyone has it ?)
>
> I then started reading the docs and the code and noticing a couple of
> problems
> 1. We set IE1 on PIO0-2 which the docs say is for PIO3+
For PIO2+ actually, according to Intel's PRM (29860004.pdf), and it's said
to have no effect in the lower modes. This is actually not very correct since
when one issues Set Transfer Mode ATA command with the value (8 + PIOn), this
means select PIO _flow control_ mode n, so -IORDY is assumed to be in use.
> I'm also not clear if the "no MWDMA0" list has been updated correctly
> for the newer chipsets.
What is/was the point for keeping MW DMA 0 support anyway? On PIIX, it's
greatly slowed down (600 vs 480 ns cycle) and was never "offically" supported
by Intel.
MBR, Sergei
next prev parent reply other threads:[~2006-05-15 15:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-25 14:43 Assorted bugs in the PIIX drivers Alan Cox
2005-11-25 14:53 ` Alan Cox
2005-11-25 15:36 ` Marc Koschewski
2005-11-25 17:12 ` Alan Cox
2006-05-15 15:12 ` Sergei Shtylyov [this message]
2006-05-15 15:59 ` Alan Cox
2006-05-15 18:26 ` Sergei Shtylyov
-- strict thread matches above, loose matches on Subject: below --
2005-11-25 15:44 SMALL, Timothy
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=44689A54.4020307@ru.mvista.com \
--to=sshtylyov@ru.mvista.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.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).