Disabling parts of memory - FC3

[throck18p at netscape.net]

I have FC3 on an A22M Thinkpad with 128 and 256 MB memory
cards.  After frequent crashes I used IBM's diagnostics to
find some flakey pages in the 256 card.  Rather than replace
the card I'd like to mark the failing pages as "in use" (or
some such) at boot so that nothing else can use them.
                                                                                
Can anyone point me to instructions or suggestions that'll
help me do this?
                                                                                
TIA, ++Paul


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