Recovering u-boot env variables to default

Following is a procedure to recover u-boot factory default environment variables. Beware of the difference between u-boot default and u-boot factory default; where the first one is default variables that won't boot the plug and the later will.

Plug the mini USB connector to the plug in order to get serial port connectivity. For setting up serial port refer to here for Windows users or here for Linux users or here for combined wiki page.

After getting u-boot messages, press any key to stop the count down and then reset the environment variables and reset the system.

 resetenv
 reset

The system in this stage will reset using the u-boot default environment variables that does system diag on every boot (will take few minutes to finish)

 Running diagnostics ...
       DDR2 data bus test                               PASSED
       DDR2 address bus test                            PASSED
       DDR2 device test                                 PASSED
 ........
 Marvell>>

Now, reprogram the environment variables to the u-boot default factory variables -

 setenv bootcmd 'nand read.e 0x800000 0x100000 0x400000; bootm 0x800000'
 setenv bootargs 'console=ttyS0,115200 mtdparts=nand_mtd:0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs) rw root=/dev/mtdblock1 rw ip=10.4.50.4:10.4.50.5:10.4.50.5:255.255.255.0:DB88FXX81:eth0:none'
 setenv ethaddr 00:50:43:4c:02:26
 setenv run_diag no
 saveenv

If you will be using the marvell git kernel or a kernel from kernel.org, then you should change the machine ID too. But if you are using the original kernel 2.6.22.18 that is shipped with the plug then you DON'T need the following -

 setenv mainlineLinux yes
 setenv arcNumber 2097

And then reset the system back again

 reset

Note that the 'ethaddr' env variable mentioned is the default; you should reprogram it with the MAC address assigned to your plug (refer to the sticker on the back of your plug).

Factory Default u-Boot Environment

Following are ALL u-boot factory default u-Boot environment variables that can be used to restore your plug back to its original state. Notes - 1. 2. Change the MAC address for your plug! 3. The ones are marked with bold are the important ones to tweak.

 baudrate=115200
 loads_echo=0
 rootpath=/mnt/ARM_FS/
 netmask=255.255.0.0
 console=console=ttyS0,115200
 CASset=min
 MALLOC_len=1
 ethprime=egiga0
 bootargs_root=root=/dev/mtdblock2 ro
 ethmtu=1500
 usb0Mode=host
 nandEcc=1bit
 ethact=egiga0
 serverip=10.10.0.2
 ipaddr=10.10.0.1
 cesvcid=ULULULULULULPPULULULULULDA
 bootargs_end=:::DB88FXX81:eth0:none
 image_name=uImage
 standalone=fsload 0x2000000 $(image_name);setenv bootargs $(console) root=/dev/mtdblock0 rw ip=$(ipaddr):$(serverip)$(bootargs_end) $(mvPhoneConfig); bootm 0x2000000;
 mvPhoneConfig=mv_phone_config=dev0:fxs,dev1:fxs
 mvNetConfig=mv_net_config=(00:11:88:0f:62:81,0:1:2:3),mtu=1500
 yuk_ethaddr=00:00:00:EE:51:81
 netretry=no
 rcvrip=169.254.100.100
 loadaddr=0x02000000
 autoload=no
 ethaddr=xx:xx:xx:xx:xx:xx
 run_diag=no
 bootargs=console=ttyS0,115200 mtdparts=nand_mtd:0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs) rw root=/dev/mtdblock1 rw ip=10.4.50.4:10.4.50.5:10.4.50.5:255.255.255.0:DB88FXX81:eth0:none
 bootcmd=nand read.e 0x800000 0x100000 0x400000; bootm 0x800000
 stdin=serial
 stdout=serial
 stderr=serial
 mainlineLinux=no
 enaMonExt=no
 enaCpuStream=no
 enaWrAllo=no
 pexMode=RC
 disL2Cache=no
 setL2CacheWT=yes
 disL2Prefetch=yes
 enaICPref=yes
 enaDCPref=yes
 sata_dma_mode=yes
 netbsd_en=no
 vxworks_en=no
 bootdelay=3
 disaMvPnp=no
 enaAutoRecovery=yes