How to create a microSD card with Gentoo RootFS

This tutorial illustrates how to generate the microSD contents to use with Gentoo Linux ported by Kdev.

Insert a blank microSD card in an USB reader and umount it.

Type dmesg to see on wich device the microSD is allocated (for example /dev/sdc).

Create a primary partition using fdisk:

$ sudo fdisk /dev/sdc
 
Command (m for help):

Type d to delete the current partition.

This operation will destroy all the data contained on /dev/sdc so please be sure that you don't need the microSD card data and that the /dev/sdc device IS the microSD card and not one of your system Hard Disk.

Command (m for help): d
Selected partition 1

Now type n and p and 1 and Enter and Enter to create a new primary partition:

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-243, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-243, default 243): 
Using default value 243

So w to write the operation selected on the microSD card:

Command (m for help): w
The partition table has been altered!
 
Calling ioctl() to re-read partition table.
Syncing disks.

Unmount the microSD ad create a ext2 filesystem on the partitioned microSD card typing:

$ sudo mke2fs -T small /dev/sdc1
mke2fs 1.41.4 (27-Jan-2009)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
489472 inodes, 1951864 blocks
97593 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=69206016
239 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks: 
	8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553, 
	1024001
 
Writing inode tables: done                            
Writing superblocks and filesystem accounting information: done
 
This filesystem will be automatically checked every 30 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

Now create a mount directory and mount on it the microSD card filesystems:

$ sudo mkdir /mnt/gentoo
$ sudo mount /dev/sdc1 /mnt/gentoo

Move in your home directory and get the rootFS files fron KDev web site:

$ cd
$ wget http://www.kdev.it/filesystem_gentoo_011009.tar
--2009-10-05 17:12:12--  http://www.kdev.it/filesystem_gentoo_011009.tar
Resolving www.kdev.it... 81.29.148.61
Connecting to www.kdev.it|81.29.148.61|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 371128118 (354M) [application/x-tar]
Saving to: `filesystem_gentoo_011009.tar'
 
100%[========================================================================>] 371,128,118  512K/s   in 12m 25s 
 
2009-10-05 17:24:37 (487 KB/s) - `filesystem_gentoo_011009.tar' saved [371128118/371128118]

Move in the microSD mount point and untar the rootFS:

$ cd /mnt/gentoo
$ sudo tar xzvpf /home/myhomedir/filesystem_gentoo_011009.tar .

When ends sync the microSD card:

$ sync
$ cd

Unmount the microSD and use it with your FOX Board G20.

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