I had device Driver which maps the physically contigous memory which was blocked at boot time (grub.cong on x64 mechine)

Now I had migrated to Itanium Server and modified the elilo to reserver the RAM.
after the booting process, Device Driver is mapping that reserved RAM. but the mapped memory not accessible for writing / reading some times system hangs
Can Any body help me

Thanx in ADVANCE
Srinivas Reddy