Re: [Gumstix-users] What happened to /dev/mmcblk0p1 and /dev/mmcblk0p2 ?

[sellis <sco...@gm...>]

I tried hot-plugging an mmc card and it didn't work. 

As long as the mmc card is in when I boot I can use it after booting,
mounting and unmounting any partition. 

I was not explicitly running mmc init in uboot when I did this. It was a
network boot. The kernel initialized the mmc card.

dmesg output:
...
mmci-omap-hs mmci-omap-hs.0: Failed to get debounce clock
mmci-omap-hs mmci-omap-hs.1: Failed to get debounce clock
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address 8fe4
mmcblk0: mmc0:8fe4 SU04G 3.69 GiB 
 mmcblk0: p1 p2 p3
VFS: Can't find a valid FAT filesystem on dev mmcblk0.
EXT3 FS on mmcblk0p2, internal journal
EXT3 FS on mmcblk0p3, internal journal
...

If I remove the mmc card, after unmounting all filesystems, and then
plug it back in I cannot remount any of the fileystems again.
Here's the error.

root@water:~# mount /dev/mmcblk0p3 /media/card
mount: /dev/mmcblk0p3: can't read superblock

So probably there is nothing wrong with your unit and you just need
to get a better image to copy to the mmc for booting.

It would be nice to be able to hot plug the mmc if your just using it
for data. Maybe someone else knows how to do this. (probably tell us 
that we risk frying the unit every time we pull/push the mmc card when
powered since it might not be designed for this ;-)

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