>>Maybe it is a problem with the busybox-internal "losetup" command, if
>>mounting the image fails in the initrd already? Did you also recompile
>>the statically linked programs inside minirt.gz?
>I think we may have the problem here: For pure 64 bits booting, we may need 64-bits busybox (static) in the minirt?
>Because the minirt worked perfectly with 64-bits kernels, I didn't suspect it had to be modified.
>Would it suffice to replace busybox with a standard Debian version, or is some compilation necessary?
I can answer this myself: Replacing busybox w/static 64-bits version in minirt.gz got the small remastering image (2.4GB) up and running.
I think it is safest to build larger versions stepwise. But this seems to work!
Cheers
Trond