Difference between revisions of "USB Boot"

Revision as of 16:16, 12 October 2010

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Note: Only possible with the APF9328DevFull and APF27 boards.

Prepare your key

• create a partition on your USB key (supposing it is recognized as /dev/sdb)

 $ sudo fdisk /dev/sdb
 n
 p
 1
 <ENTER>
 <ENTER>
 w

• format it as ext2:

 $ sudo mkfs.ext2 /dev/sdb1

• mount it:

 $ sudo mount /dev/sdb1 /media/disk/

• copy rootfs on it:

 $ make shell_env
 $ source armadeus_env.sh
 $ sudo tar xvf $ARMADEUS_ROOTFS_TAR -C /media/disk/
 $ sudo umount /media/disk/

Prepare your kernel

• Linux should be compiled with USB Host driver as static (done by default in current Armadeus configuration). For example on the APF9328:

 $ make linux26-menuconfig

 Device Drivers  ---> 
     Armadeus specific drivers  ---> 
         <*>   isp1761 USB 2.0 Host controller

Set environment variables in U-Boot

BIOS> setenv usbroot /dev/sda1
BIOS> setenv usbrootfstype ext2
BIOS> setenv addusbargs setenv bootargs \${bootargs} root=\${usbroot} rootfstype=\${usbrootfstype} rootdelay=5
BIOS> setenv usbboot setenv bootargs \${console}\;run addusbargs addipargs\; bootm \${kernel_addr}
...
BIOS> saveenv

Let's go

BIOS> run usbboot