Buster 11 semaphore

["Matthias Scheler" <tron%lyssa.owl.de@localhost>]

        Hi,

as some of you may know Dave H. messed up Buster 11 again. As soon as two
Z3 boards try to use busmaster DMA nasty things will happen. The new
versions of the "z3scsi.device" and "cyberscsi.device" will have a
a "buster 11 usage" semaphore to prevent such problems.

I would like to suggest to add such a feature to NetBSD-amiga and use it
in the Z3 SCSI drivers (A4091 and Z3 Fastlane so far). Of course there
should be a possibility to deactive this kludge for the improbable
case that we will ever get a Buster 12.

Opinions?

-- 
Matthias Scheler
tron%lyssa.owl.de@localhost