Wiping microSD card and copying on OpenEmbedded image
First, you have to figure out the name of the card that you want to wipe in your device hierarchy. To do this, check dmesg, insert the card, and then check dmesg again. The new text that shows up at the end should tell you where the card you inserted was mounted-- it's often something like
(Note cautionary tale about accidentally wiping hard drive's boot sector at the end of blog post.)
Wipe the card clean
(Warning: this, uh, wipes the card clean.)
brandon@milo:/oe$ sudo -s # become the superuser. [sudo] password for brandon: root@milo:/oe# umount /dev/sdb1 # unmount the card root@milo:/oe# mkfs.ext3 -L rascal-beta /dev/sdb1 # wipe everything and make a new EXT3 filesystem mke2fs 1.41.12 (17-May-2010) Filesystem label=transcend-ext3 OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 246512 inodes, 984320 blocks 49216 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1010827264 31 block groups 32768 blocks per group, 32768 fragments per group 7952 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736 Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 29 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
Now, pull the card out and reinsert it so that it gets remounted.
Find an archive of the filesystem you want to use
Tarballs of the stock filesystem can be found on the sources page. Download one of these, copy it onto your card, and extract the filesystem.
root@milo:/oe# whoami # check that you're still the superuser root root@milo:/oe# ls /media # check that the card is mounted rascal-beta wget http://rascalmicro.com/files/rascal-filesystem-beriberi-2012-11-09.tar.gz mv rascal-filesystem-beriberi-2012-11-09.tar.gz /media/rascal-beta/ cd /media/rascal-beta tar xzvf rascal-filesystem-beriberi-2012-11-09.tar.gz # extract the filesystem rm rascal-filesystem-beriberi-2012-11-09.tar.gz # delete the tarball sync # make sure all the data is committed to the card exit # relinquish root privileges
Last, pull out the card and put it back into the Rascal.
The reverse direction: archiving a filesystem
If you want to archive a filesystem, start by unplugging your Rascal, extracting the card, and putting it into your computer.
cd /media/rascal-beta/ # change to the root of your SD card sudo tar czvf /path/to/your/new/tarball.tar.gz *
If you have space on the card, you can generate the tarball on the card itself, but it's probably a better idea to generate it on your host computer directly. You have to move it there, anyway.