View source for Uboot for GuruPlug

= GuruPlug, GuruPlug Server Plus =

Here's how to allow your GuruPlug to boot from a USB drive.<br/>
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]]
* 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.
* Some version of the GuruPlug have been shipped with a uboot that does not support Booting from USB, ESATA or SD-Card. If this is your case, then you have to upgrade uboot. To do this, the best howto I found is this : http://oinkzwurgl.org/guruplug_uboot

* 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 x_bootargs_root 'root=/dev/sdc1 rootdelay=10'
 setenv x_bootcmd_kernel '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''.
It must look like this:

 GuruPlug>> printenv
 bootcmd=${x_bootcmd_usb}; ${x_bootcmd_kernel}; setenv bootargs ${x_bootargs} ${x_bootargs_root}; bootm 0x6400000;
 bootdelay=3
 baudrate=115200
 x_bootcmd_usb=usb start
 ethact=egiga0
 x_bootcmd_kernel=ext2load usb 1:1 0x6400000 /boot/uImage
 arcNumber=2653
 mainlineLinux=yes
 x_bootargs_root=root=/dev/sdc1 rootwait
 x_bootargs=console=ttyS0,115200
 stdin=serial
 stdout=serial
 stderr=serial