It has come to my attention that the current 2.4 A20-enabling code still
has two problems: it doesn't work on machines for which the "fast A20
gate" bit has been hijacked for other uses (e.g. Olivetti); apparently
it doesn't work on some more modern "legacy free" systems either
(apparently the "Compaq 5Bw160" might be in this category - currently
unconfirmed.) I have ported the current A20 code from SYSLINUX (it has
been stable there since version 1.52) and I would really appreciate it
(PLEASE PLEASE PRETTY PLEASE) if people would try it out and see how it
works before sending it to Linus and Alan; I'd like to know any
combination of "works/doesn't work with the patch" and "works/doesn't
work without the patch..."
This version first tests for the A20 gate already being enabled (e.g.
"legacy free" systems), and secondly tries to use the BIOS function (int
15h, AX=2401h) if it exists. If not it tries the KBC and finally port 92h.
The patch is against 2.4.8-pre8; I have tried to test it as well as I
can, which is somewhat hard since I don't actually have any machines
which exhibit these pathologies; they do, however, support A20 unmasking
via the BIOS, so that part can be considered tested; and, of course, the
SYSLINUX code that was the porting basis has been in production use
since version 1.52, which was released over six months ago.
-hpa
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