This is not the whole picture. It looks like the Cirrus chipsets
support a linear frame buffer at certain given addresses (14, 64, and
64+14 MB), but the cards they've built on this chip set sometimes
limit them to 16 MB, sometimes not. There apparently is no other way
to find out than trying. (ISA cards and VLB designs that were derived
from ISA designs can't address more than 16 MB.)
I have a no-name CLGD 5426-based VLB card which works in a mobo
equipped with 36 MB, with a linear frame buffer at 78 MB. Other than
that, this VGA sucks. :-)
(About the 14-16MB memory hole: AFAIK Linux doesn't support that.)
olaf
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