RHEL4 isn't recognizing all my RAM
I was wondering if someone could help me with a problem of RHEL4 not detecting all my RAM. When I boot up my server computer, it displays a warning that RHEL4 needs 256 mb ram to run as a supported configuration (only 181 detected).
I am running Red Hat Enterprise Linux ES release 4 (Nahant) Kernel 2.6.9-5.ELsmp on an x86_64. I have a Dual Xeon processor (2.40) with 1gb of ram. When I check my BIOS settings, the System Memory = 1024 MB ECC DDR2
When I type in free -m at the control prompt, I get the following:
total used free shared buffers cached
Mem: 181 180 0 0 1 36
-/+ buffers/cache 142 38
Swap: 8191 92 8099
So, how can I configure Red Hat to recognize all my memory? Any help would be aprreciated.