From: Mark Lord <liml@rtr.ca>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Malcolm Gillies <malcolm@g7.org>, linux-ide@vger.kernel.org
Subject: Re: CompactFlash and HD unhappy together on the same IDE channel
Date: Sun, 23 Sep 2007 12:26:37 -0400 [thread overview]
Message-ID: <46F693BD.8070604@rtr.ca> (raw)
In-Reply-To: <20070922191248.5f2bc74a@the-village.bc.nu>
Alan Cox wrote:
>> I've acquired a new CF card that is capable of UDMA2, and with the same
>> connectors, wiring and adaptor (i.e. I popped out the MWDMA card and
>> inserted the UDMA one), I can now boot and read data on both devices
>> without error at reasonable speeds.
>
> Fascinating. Does point more to a driver funny you are right. At the
> moment I'm at a loss to guess what
We seem to have had a lot of reports of CF cards failing with MDMA modes recently.
Some of these reports are because of SATA<>PATA bridge chips that don't support MDMA,
others are due to unknowns.
The solution is beginning to look more and more obvious: default to not use MDMA
modes for CF devices at boot. And eventually provide a sysfs or libata parameter
(or support/snoop SET_XFER_MODE) to change the mode later.
Cheers
next prev parent reply other threads:[~2007-09-23 16:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-18 7:00 CompactFlash and HD unhappy together on the same IDE channel Malcolm Gillies
2007-08-18 20:05 ` Matt Sealey
2007-08-18 22:41 ` Alan Cox
2007-08-19 1:16 ` Mark Lord
2007-08-19 10:43 ` Malcolm Gillies
2007-08-19 14:18 ` Mark Lord
2007-08-20 7:34 ` Malcolm Gillies
2007-08-19 16:56 ` Alan Cox
2007-09-15 23:54 ` Malcolm Gillies
2007-09-22 18:12 ` Alan Cox
2007-09-23 14:49 ` Matt Sealey
2007-09-23 16:26 ` Mark Lord [this message]
2007-09-23 17:40 ` Alan Cox
2007-09-24 22:03 ` Mark Lord
2007-09-24 22:29 ` Alan 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=46F693BD.8070604@rtr.ca \
--to=liml@rtr.ca \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-ide@vger.kernel.org \
--cc=malcolm@g7.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).