Lenny: Unable to mount initrd

[Peter Senna Tschudin <peter.senna@gmail.com>]

Dear Members,

I've downloaded Lenny installation files for s390 from:
http://ftp.debian.org/debian/dists/lenny/main/installer-s390/current/images/generic/

I've uploaded files to the System Z but kernel was not able to mount
the initrd. The most strange is that normally after the word "tried:"
there is ext2, ext3 and cramfs.

See the output error:
Ý17179570.039030¨ RAMDISK: Compressed image found at block 0
Ý17179570.491238¨ List of all partitions:
Ý17179570.491262¨ No filesystem could mount root, tried:
Ý17179570.491281¨ Kernel panic - not syncing: VFS: Unable to mount
root fs on unknown-block(1,0)

What can I do?

Regards,

Peter