[comp.sys.m88k] Anyone have ANY experience with MVME188BUG???

terryl@sail.LABS.TEK.COM (04/11/91)

     We have some hardware based on the Motorola Hypermodule (multiple
88ks on a card), and we're trying to use Motorola's MVME188BUG debugger
to do disk reads(using the .DSKRD trap function), and it appears that
the blocks we ask for are not necessarily the blocks that are read.

     Specifically, we are trying to modify the secondary boot code to
recognize a Berkeley Fast File system, and we have to "fudge" the disk
block numbers fed to the .DSKRD trap function; unfortunately, the "fudge"
factor is not constant for the whole disk, and through empirical methods
(read: brute force method) varies depending where on the disk we try to
read from.

     So, the question(s) is(are) this: Is there anyone out there who has done
something like this?? Is there some environment that we need to set up
in order for this to work??? About the only configuration thing we can see
is the ROMs look like they are identified as "Version 4.1", and yes, we do
have the docomentation for MVME188BUG, but there's a LOT of assumptions
that are made in the original Motorola secondary boot code that aren't
mentioned in the manual (like disk block numbers are in terms of 256 byte
sectors, instead of 512 byte sectors; ditto for counts...).

			Terry Laskodi
			     of
			Tektronix

		terryl@sail.labs.tek.com	(If your mailer groks domains)

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