Problem booting Pogo Mobile (3 replies)

I own a pogoplug V4 and a mobile.
The first one runs fine since spring, so now I decided to upgrade the mobile as well as pogoplug was shutting down its services.
I installed U-Boot 2016.05 on both devices with modified default envs.
But while V4 boots fine, mobile gets stuck after loading kernel with same USB-stick, Doesn't load until IP-adress is assigned.
Tried with "dtb_file"env set and unset with same result.

Can someone give me a hint where the problem is?

fw_printenv:

bootcmd_exec=run load_uimage; if run load_initrd; then if run load_dtb; then bootm $load_uimage_addr $load_initrd_addr $load_dtb_addr; else bootm $load_uimage_addr $load_initrd_addr; fi; else if run load_dtb; then bootm $load_uimage_addr - $load_dtb_addr; else bootm $load_uimage_addr; fi; fi
bootcmd_uenv=run uenv_load; if test $uenv_loaded -eq 1; then run uenv_import; fi
bootdev=usb
device=0:1
devices=usb ide mmc
disks=0 1 2 3
ethact=egiga0
if_netconsole=ping $serverip
led_error=orange blinking
led_exit=green off
led_init=green blinking
load_dtb_addr=0x1c00000
load_initrd_addr=0x1100000
load_uimage_addr=0x800000
load_dtb=echo loading DTB $dtb_file ...; load $bootdev $device $load_dtb_addr $dtb_file
load_initrd=echo loading uInitrd ...; load $bootdev $device $load_initrd_addr /boot/uInitrd
load_uimage=echo loading uImage ...; load $bootdev $device $load_uimage_addr /boot/uImage
mainlineLinux=yes
mtdids=nand0=orion_nand
partition=nand0,2
scan_disk=echo running scan_disk ...; scan_done=0; setenv scan_usb "usb start";  setenv scan_ide "ide reset";  setenv scan_mmc "mmc rescan"; for dev in $devices; do if test $scan_done -eq 0; then echo Scan device $dev; run scan_$dev; for disknum in $disks; do if test $scan_done -eq 0; then echo device $dev $disknum:1; if load $dev $disknum:1 $load_uimage_addr /boot/uImage 1; then scan_done=1; echo Found bootable drive on $dev $disknum; setenv device $disknum:1; setenv bootdev $dev; fi; fi; done; fi; done
set_bootargs=setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 $mtdparts $custom_params
stderr=serial
stdin=serial
stdout=serial
uenv_addr=0x810000
uenv_import=echo importing envs ...; env import -t $uenv_addr $filesize
uenv_init_devices=setenv init_usb "usb start";  setenv init_ide "ide reset";  setenv init_mmc "mmc rescan"; for devtype in $devices; do run init_$devtype; done;
uenv_load=run uenv_init_devices; setenv uenv_loaded 0; for devtype in $devices;  do for disknum in 0; do run uenv_read_disk; done; done;
uenv_read_disk=if test $devtype -eq mmc; then if $devtype part; then run uenv_read;  fi; else if $devtype part $disknum; then run uenv_read; fi;  fi
uenv_read=echo loading envs from $devtype $disknum ...; if load $devtype $disknum:1 $uenv_addr /boot/uEnv.txt; then setenv uenv_loaded 1; fi
usb_ready_retry=15
ethaddr=aa:bb:cc:d:ee:ff
arcNumber=3960
machid=F78
usb_rootfstype=ext3
mtdparts=mtdparts=orion_nand:2M(u-boot),3M(uImage),3M(uImage2),8M(failsafe),112M(root)
preboot_nc=setenv nc_ready 0; for pingstat in 1 2 3 4 5; do; sleep 1; if run if_netconsole; then setenv nc_ready 1; fi; done; if test $nc_ready -eq 1; then run start_netconsole; fi
preboot=run preboot_nc
serverip=192.168.0.110
bootcmd_pogo=if ubi part root 2048 && ubifsmount ubi:rootfs && ubifsload 0x800000 uboot.mtd0.dockstar.original.kwb ; then go 0x800200; fi
bootcmd=run bootcmd_uenv; run scan_disk; run set_bootargs; run bootcmd_exec; run bootcmd_pogo; reset
bootdelay=3
start_netconsole=setenv ncip $serverip; setenv bootdelay 3; setenv stdin nc; setenv stdout nc; setenv stderr nc; version;
dtb_file=/boot/dts/kirkwood-pogoplug_v4.dtb
ipaddr=192.168.0.106

NC output:

U-Boot 2016.05-tld-1 (Jun 12 2016 - 13:41:47 -0700)
Pogoplug V4
gcc (Debian 4.9.2-10) 4.9.2
GNU ld (GNU Binutils for Debian) 2.25
Hit any key to stop autoboot:  0
starting USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 2 USB Device(s) found
       scanning usb for storage devices...
Use USB retry period from the environment: 15 second(s)
1 Storage Device(s) found

Reset IDE: ide_preinit failed

Partition Map for USB device 0  --   Partition Type: DOS

Part    Start Sector    Num Sectors     UUID            Type
  1     2048            8017824         d5269418-01     83
loading envs from usb 0 ...
 usb
1 bytes read in 123 ms (0 Bytes/s)
Found bootable drive on usb 0
loading uImage ...
2875692 bytes read in 295 ms (9.3 MiB/s)
loading uInitrd ...
6183666 bytes read in 523 ms (11.3 MiB/s)
loading DTB /boot/dts/kirkwood-pogoplug_v4.dtb ...
10028 bytes read in 543 ms (17.6 KiB/s)
## Booting kernel from Legacy Image at 00800000 ...
   Image Name:   Linux-3.18.5-kirkwood-tld-1
   Created:      2016-05-26  23:38:38 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2875628 Bytes = 2.7 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Loading init Ramdisk from Legacy Image at 01100000 ...
   Image Name:   initramfs-3.18.5-kirkwood-tld-1
   Created:      2016-05-26  23:38:40 UTC
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    6183602 Bytes = 5.9 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 01c00000
   Booting using the fdt blob at 0x1c00000