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Make bootable SD-Card

Create two partition in your SD card. Boot stream file is going to be installed in 1st
partition (type 53 - OnTrack DM6 Aux3 )and rootfs in second partition (type 83 - Linux).
Here is an example of 2G SD card with two partitions :

Disk /dev/sdb: 1977 MB, 1977614336 bytes  
61 heads, 62 sectors/track, 1021 cylinders, total 3862528 sectors  
Units = sectors of 1 * 512 = 512 bytes  
Sector size (logical/physical): 512 bytes / 512 bytes  
I/O size (minimum/optimal): 512 bytes / 512 bytes  
Disk identifier: 0x00000000  

  Device Boot      Start         End      Blocks   Id  System  
/dev/sdb1            2048       33297       15625   53  OnTrack DM6 Aux3  
/dev/sdb2           33298     3862527     1914615   83  Linux  

Formatting and partitioning a SD card

Insert your SD card into a card reader of your linux developing machine and list partition
tables for all disks:

$: sudo fdisk -l

Identify your SD disk. In this example SD disk is recognized as /dev/sdb.
Unmount all mounted partitions, i.e. sudo umount /dev/sdb2.
Run fdisk:

$: sudo fdisk /dev/sdb  
      o Press 'p' to show the partitions on the card  
      o Press 'd' to delete a partition. Repeat to remove all partitions  
      o Press 'n' to create a new partition  
       + press 'p' to select the primary partitio  
       + press '1' for creating partition 1 on the card  
       + press Enter to start from first block  
       + Type '+16MB' to create the 16MB partitions  
      o Press 't' to change the newly created partition type  
       + Enter '53' for the new partition type  
      o Press 'n' to create a second partition  
       + Press Enter to accept all default setting  
      o Press 'w' to write  the partitions to the card and exit the fdisk  

Installing rootfs

In this example SD disk is recognized as /dev/sdb. Format the second partition on the SD card:

$: sudo mkfs.ext3 /dev/sdb2  

Make mount point directory /mnt/mmc

$: sudo mkdir /mnt/mmc  

Mount the partition /dev/sdb2 on mount point directory /mnt/mmc:

$: sudo mount /dev/sdb2 /mnt/mmc  

Copy the rootfs to mount point directory:

$: sudo cp -a `<path_to_your_rootfs> ` /mnt/mmc  

Unmount SD disk:

$: sudo umount /dev/sdb2  
$: sync  

At this point the SD card should be ready for use.