linux-kernel - Re: Fwd: Mounting MMC card

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Date:	Fri, 29 Jun 2007 15:00:42 +0530
From:	"Midhun Agnihotram" <agnimidhun@...il.com>
To:	"Pierre Ossman" <drzeus-mmc@...eus.cx>
Cc:	"Hans-Jürgen Koch" <hjk@...utronix.de>,
	jdi@....org, linux-kernel@...r.kernel.org
Subject: Re: Fwd: Mounting MMC card

Hi All,

> Let's try something a lot less complex than mounting. Try running:
>         dd if=/dev/mmcblk0 of=/dev/null count=100

    Here goes the output(error).

/ # dd if=/dev/mmcblk0 of=/dev/null count=100
dd: can't open '/dev/mmcblk0': No such device or address

    The /dev is has the following:

/ # ls -l /dev | grep mmc
brwxrwxrwx    1 0        0        254,   0 Jun 26  2007 mmcblk0
brwxrwxrwx    1 0        0        254,   1 Jun 26  2007 mmcblk0p0
brwxrwxrwx    1 0        0        254,   2 Jun 26  2007 mmcblk0p1
brwxrwxrwx    1 0        0        254,   3 Jun 26  2007 mmcblk0p2
brwxrwxrwx    1 0        0        254,   4 Jun 26  2007 mmcblk0p3

    So are the device nodes wrong? When i say `cat /proc/devices` it says :

/ # cat /proc/devices
Character devices:
  1 mem
  2 pty
  3 ttyp
  4 /dev/vc/0
  4 tty
  4 ttyS
  5 /dev/tty
  5 /dev/console
  5 /dev/ptmx
  7 vcs
 10 misc
 13 input
 29 fb
 90 mtd
128 ptm
136 pts

Block devices:
  1 ramdisk
  1 ramdisk
 31 mtdblock
254 mmc

  So is the major number 254 is correct for MMC ??

Midhun.
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