Pogoplug Mobile won't boot (no replies)

I've been looking for answer in the forum for days still can't get the Pogoplug Mobile to boot.

The machine is pogoplug mobile.
I modified the uboot following http://forum.doozan.com/read.php?2,11663.
I tried rootfs on both usb drive and SD card following the instruction here(http://forum.doozan.com/read.php?2,12096).
It won't boot. The light is off. No ip is assigned.
I can connect with serial cable.


Here is the env

arcNumber=2097
baudrate=115200
bootargs=console=ttyS0,115200 root=/dev/sda1 rootdelay=10 rootfstype=ext2 mtdparts=orion_nand:2M(u-boot),3M(uImage),3M(uImage2),8M(failsafe),112M(root)
bootcmd=usb start; run force_rescue_bootcmd; run ubifs_bootcmd; run usb_bootcmd; usb stop; run mmc_bootcmd
bootdelay=3
console=ttyS0,115200
ethact=egiga0
ethaddr=00:25:31:03:87:ac
force_rescue=0
force_rescue_bootcmd=if test $force_rescue -eq 1 || ext2load usb 0:1 0x1700000 /rescueme 1 || fatload usb 0:1 0x1700000 /rescueme.txt 1; then run rescue_bootcmd; fi
if_netconsole=ping $serverip
ipaddr=192.168.20.129
led_error=orange blinking
led_exit=green off
led_init=green blinking
mainlineLinux=yes
mmc_bootcmd=mmc init; mmc init;ext2load mmc 0:1 0x00800000 /boot/uImage; if ext2load mmc 0:1 0x01100000 /boot/uInitrd; then bootm 0x800000 0x1100000; else bootm 0x800000; fi
mtddevname=uImage2
mtddevnum=2
mtdids=nand0=orion_nand
mtdparts=mtdparts=orion_nand:2M(u-boot),3M(uImage),3M(uImage2),8M(failsafe),112M(root)
partition=nand0,2
pogo_bootcmd=if fsload uboot-original-mtd0.kwb; then go 0x800200; fi
preboot=run if_netconsole start_netconsole
rescue_bootcmd=if test $rescue_installed -eq 1; then run rescue_set_bootargs; nand read.e 0x800000 0x100000 0x400000; bootm 0x800000; else run pogo_bootcmd; fi
rescue_installed=0
rescue_set_bootargs=setenv bootargs console=$console ubi.mtd=2 root=ubi0:rootfs ro rootfstype=ubifs $mtdparts $rescue_custom_params
serverip=192.168.20.1
start_netconsole=setenv ncip $serverip; setenv bootdelay 10; setenv stdin nc; setenv stdout nc; setenv stderr nc; version;
stderr=serial
stdin=serial
stdout=serial
ubifs_bootcmd=run ubifs_set_bootargs; if ubi part data && ubifsmount rootfs && ubifsload 0x800000 /boot/uImage && ubifsload 0x1100000 /boot/uInitrd; then bootm 0x800000 0x1100000; fi
ubifs_mtd=3
ubifs_set_bootargs=setenv bootargs console=$console ubi.mtd=$ubifs_mtd root=ubi0:rootfs rootfstype=ubifs $mtdparts $ubifs_custom_params
usb_boot=mw 0x800000 0 1; ext2load usb $usb_device 0x800000 /boot/uImage; if ext2load usb $usb_device 0x1100000 /boot/uInitrd; then bootm 0x800000 0x1100000; else bootm 0x800000; fi
usb_bootcmd=run usb_init; run usb_set_bootargs; run usb_boot
usb_device=0:1
usb_init=usb stop; usb start; run usb_scan
usb_root=/dev/sda1
usb_rootdelay=10
usb_rootfstype=ext2
usb_scan=usb_scan_done=0;for scan in $usb_scan_list; do run usb_scan_$scan; if test $usb_scan_done -eq 0 && ext2load usb $usb 0x800000 /boot/uImage 1; then usb_scan_done=1; echo "Found bootable drive on usb $usb"; setenv usb_device $usb; setenv usb_root /dev/$dev; fi; done
usb_scan_1=usb=0:1 dev=sda1
usb_scan_2=usb=1:1 dev=sdb1
usb_scan_3=usb=2:1 dev=sdc1
usb_scan_4=usb=3:1 dev=sdd1
usb_scan_list=1 2 3 4
usb_set_bootargs=setenv bootargs console=$console root=$usb_root rootdelay=$usb_rootdelay rootfstype=$usb_rootfstype $mtdparts $usb_custom_params

And here is serial output

U-Boot 2011.12 (Apr 08 2012 - 19:03:41)
Cloud Engines-Pogoplug v4/Mobile:MMC version

SoC:   Kirkwood 88F6281_A1
DRAM:  128 MiB
WARNING: Caches not enabled
NAND:  128 MiB
In:    serial
Out:   serial
Err:   serial
Net:   egiga0
Using egiga0 device
ping failed; host 192.168.20.1 is not alive
Hit any key to stop autoboot:  0
(Re)start USB...
USB:   Register 10011 NbrPorts 1
USB EHCI 1.00
scanning bus for devices... 2 USB Device(s) found
       scanning bus for storage devices... 1 Storage Device(s) found
** Bad partition 1 **

** Unable to use usb 0:1 for fatload **
incorrect device type in data
Partition data not found!
stopping USB..
(Re)start USB...
USB:   Register 10011 NbrPorts 1
USB EHCI 1.00
scanning bus for devices... 2 USB Device(s) found
       scanning bus for storage devices... 1 Storage Device(s) found
** Bad partition 1 **
** Block device usb 1 not supported
** Block device usb 2 not supported
** Block device usb 3 not supported
** Bad partition 1 **
** Bad partition 1 **
Wrong Image Format for bootm command
ERROR: can't get kernel image!
stopping USB..
No MMC card found
No MMC card found
** Bad partition 1 **
** Bad partition 1 **
Wrong Image Format for bootm command
ERROR: can't get kernel image!
Pogov4>

Any advice is appreciated.

PS, I'm a newbie to linux and rootfs. Please let me know if any other information is needed. Thanks in advance.