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From: Warner Losh <imp@FreeBSD.org>
Date: Wed, 28 Mar 2007 22:31:32 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/boot/arm/at91/libat91 sd-card.c
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imp         2007-03-28 22:31:32 UTC

  FreeBSD src repository

  Modified files:
    sys/boot/arm/at91/libat91 sd-card.c 
  Log:
  All SD cards have a block size of 512.  The READ_BL_LEN field in the
  CSD is usually 512 (well, 9), but for 2GB (and the rogue 4GB SD cards)
  it is 1024 (or 2048 for 4GB).  This value doesn't work for the block
  read commands (which really want 512).  Hardcode 512 for those.  This
  may break really old MMC cards that don't have a 512 block size (I've
  never seen one: make my day and send me one :-), but since the MMC
  side of the house is currently broken, it should only have the effect
  that 2GB (and non-conforming 4GB) SD cards will work.
  
  My 'non-conforming' 4GB SD card also works now too.  The
  non-conforming 4GB SD cards were sold for a while before the SD
  association was worried they would be (a) incompatible (different FAT
  flavor on them) and (b) confusing for the new SDHC standard and
  cracked down on suppliers' bogus use of the SD trademark...
  
  Revision  Changes    Path
  1.4       +6 -4      src/sys/boot/arm/at91/libat91/sd-card.c