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From: Pierre Ossman <>
To: Eugene Ilkov <>
Subject: Re: 2.6.20 mmc: problem with highspeed SD card
Date: Thu, 15 Feb 2007 06:48:12 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Eugene Ilkov wrote:
> I have I/O errors with Transcend SD highspeed card 2GB/150x when it's
> mounted in r/w mode (cardreader on sharp sl-c1000)
> It works well  if I reverse mmcv4 patch commited to 2.6.19-git2
> (

That patch is not the same as you are referencing in the rest of your mail.

> I'm not experienced in mmc, but I figured out that problem is
> somewhere in mmc_read_switch_caps() and when i change cmd.arg value
> from 0x80FFFFF1 to 0x00FFFFF1 it works fine too
> What argument should have SD_SWITCH opcode?

The argument is correct, so I'm guessing that your controller might be a bit
flaky and not handle the new timing. Can you enable MMC_DEBUG and send over the


     -- Pierre Ossman

  Linux kernel, MMC maintainer
  PulseAudio, core developer
  rdesktop, core developer

  reply	other threads:[~2007-02-15  5:48 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-14  1:46 Eugene Ilkov
2007-02-15  5:48 ` Pierre Ossman [this message]
2007-02-15 12:17   ` Eugene Ilkov
2007-02-15 16:39     ` Pierre Ossman
2007-02-15 16:52     ` Pierre Ossman
2007-02-15 17:08       ` Pierre Ossman
2007-02-15 22:44         ` Eugene Ilkov

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