BeagleXm Rev C vs. BeagleXm Rev A


I am facing a problem to mount root filesystem from uSD card on
BeagleXm Rev C board. On bXm-C board, the message is like below. The
SD card is mounted as 'ro' (readonly).

[ 4.599700] mmc0: new high speed SDHC card at address 1234
[ 4.608551] mmcblk0: mmc0:1234 SA04G 3.67 GiB (ro)
[ 4.620666] mmcblk0: p1 p2
[ 17.093261] VFS: Cannot open root device "mmcblk0p2" or unknown-
[ 17.100677] Please append a correct "root=" boot option; here are
the available partitions:
[ 17.109527] b300 3858432 mmcblk0 driver: mmcblk
[ 17.115142] b301 72261 mmcblk0p1
[ 17.123535] b302 3783307 mmcblk0p2
[ 17.131927] Kernel panic - not syncing: VFS: Unable to mount root
fs on unknown-block(179,2)

While on BeagleXm RevA board, the SD card is mounted as 'r+w'. rootfs
can be mounted without problem. below is the log from bXm-A board.

[ 4.510986] mmc0: host does not support reading read-only switch.
assuming write-enable.
[ 4.531707] mmc0: new high speed SD card at address 0001
[ 4.540405] mmcblk0: mmc0:0001 00000 1.89 GiB
[ 4.551330] mmcblk0: p1 p2
[ 4.797637] usb 1-2.1: new high speed USB device using ehci-omap
and address 3
[ 4.923278] usb 1-2.1: New USB device found, idVendor=0424,
[ 4.930480] usb 1-2.1: New USB device strings: Mfr=0, Product=0,
[ 17.064392] EXT3-fs: barriers not enabled
[ 19.405639] kjournald starting. Commit interval 5 seconds
[ 19.411773] EXT3-fs (mmcblk0p2): warning: mounting unchecked fs,
running e2fsck is recommended
[ 19.590576] EXT3-fs (mmcblk0p2): using internal journal
[ 19.596099] EXT3-fs (mmcblk0p2): recovery complete
[ 19.666961] EXT3-fs (mmcblk0p2): mounted filesystem with ordered
data mode
[ 19.674713] VFS: Mounted root (ext3 filesystem) on device 179:2.

Does anybody know what is the cause? How to fix the problem?


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