Problem with red hat 7.2 for s390

Hello,
Excuse me in advance for my poor english 

I write you because i have a problem with red hat 7.2 for s390. I have done 
all steps for pre-installation (detect ethernet card, dasd etc...)...well 
when i log in in console, loader don't 
start; example.... 

[root@root root]# ssh 10.12.8.202 

Welcome to Red Hat Linux environment (v 0.45) for S/390. 

Now run 'loader' to install Red Hat Linux. 

# loader 


At this point loader blocked here for ever. I have studied all advisory in 
red hat site but nothing. Can you help me for this problem? 

My configuration is: Multriprise 3000, 1 processor and i want install red hat 
in LPAR (i assigned 256 Mb of RAM)


Regards, 
Marco Ortisi