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added how to read usb partition
You'll need an access to the serial console to achieve this, the JTAG module is OK.
* To connect to the bootloader, proceed exactly like for the [[Marvell Plug Computer|Sheevaplug: http://wiki.amahi.org/index.php/Marvell_Plug_Computer ]]
* Reset the GuruPlug.
* At the terminal, press enter a couple of seconds after boot to prevent it from booting using the onboard flash (Ubuntu). You should end up with a prompt.
* There are some commands you need to run to make it permanently boot from the USB port ('''NOTE:''' this step is only necessary once):
setenv mainlineLinux yes
setenv bootargs_root x_bootargs_root 'root=/dev/sdb1 sdc1 rootdelay=1510' setenv bootcmd_usb x_bootcmd_kernel 'usb start; ext2load usb 1:1 0x6400000 /boot/uImage'
saveenv
To determine 1:1 in the command above
usb start
usb part
## Unknown partition table
## Unknown partition table
Partition Map for USB device 2 -- Partition Type: DOS
Partition Start Sector Num Sectors Type
1 63 14586957 b
2 14587020 1060290 82
here you have device 2 and you want to boot Partition 1 so use 2:1 (as opposed to 1:1 in the command above).
While still under the bootloader , check your environment with ''printenv''.
arcNumber=2653
mainlineLinux=yes
x_bootargs_root=root=/dev/sdb1 rootdelay=15sdc1 rootwait
x_bootargs=console=ttyS0,115200
stdin=serial
stdout=serial
stderr=serial
