kernel config for memory > 1 Gig?

[Johnson, Shaunn]

Howdy:

Can someone tell me if RHEL ES ver 3.0 (2.4.21-4.EL #1)
is automatically setup to see memory greater than 1 Gig
after the install?

I put in 1.5 Gig of RAM, but all I see is something close
to 1.  Do I need to recompile the kernel or something 
to get the box to see anything more?  

Thanks!

-X
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