Those bootargs do not look quite correct. Not sure if it was the case here, but I found when cutting and pasting big chunks of text, sometimes a few characters get dropped.
These are from my env:
Code
bootcmd_spark=nboot.i 0x80000000 0 0x00100000 ;bootm 0x80000000
bootcmd_enigma2=nboot.i 0x80000000 0 0x18000000 ;bootm 0x80000000
bootargs_spark=console=ttyAS1,115200 rw ramdisk_size=6144 root=/dev/ram0 init=/linuxrc nwhwconf=device:eth0,hwaddr:00:80:E1:12:40:69 ip=192.168.0.69:192.168.3.119:192.168.3.1:255.255.0.0:Spark:eth0:off stmmaceth=msglvl:0,phyaddr:1,watchdog:5000 bigphysarea=7000
bootargs_enigma2=console=ttyAS1,115200 rw root=/dev/mtdblock6 rootfstype=jffs2 init=/bin/devinit coprocessor_mem=4m@0x40000000,4m@0x40400000 printk=1 nwhwconf=device:eth0,hwaddr:00:80:E1:12:40:61 ip=172.100.100.249:172.100.100.174:172.100.100.174:255.255.0.0:Enigma2:eth0:off stmmaceth=msglvl:0,phyaddr:2,watchdog:5000 bigphysarea=6000
If it still does not boot, maybe the image is corrupt.
There was an old update which included the uboot code, but I don't recall at the moment the version but I am sure it was posted here.
BTW - if you change the console to ttyAS0, you can use your terminal to see boot/runtime messages...
Attached are some files you might find useful. (I never used the uboot bin, so can't say for sure it is correct...)