🚀 go-pugleaf

Hello all. I'm in the process of writing some hard disk driver code for
a GVP Series II controller under AmigaMINIX. I need to know about the
contents of the various elements of the environment array in the PART
blocks. Here's what I've figured out so far:

n	pb_Environment[n]
-------------------------------------------------
0	?
1	Longs per block (==128)
2	?
3	Heads per cyl
4	?
5	Sectors per track
6	Reserved blocks
7	?
8	?
9	Low cyl of partition
10	High cyl of partition
11	Number of buffers to use
12	?
13	MaxTransfer
14	Mask for address
15	Boot priority of partition
16	?

A few other questions:

1)	Can I safely use the reserved blocks? They wouldn't be needed
	for the Minix filesystem.

2)	Am I correct in assuming that:
	block = cyl * heads_per_cyl * secs_per track +
		head * secs_per_track +
		sec;
	is the correct formula, ie cyl is the most significant digit,
	followed by the head, followed by the sector? Or is a different
	convention used?

3)	Does anyone know how to program the GVP Series II at a low
	level, or know where to find such info (other than GVP, I'm
	asking them now but I suspect it may take a while).  All I
	really need are two functions:

	unknown	= scsiinit(unknown); 
	/* init/find the board, if needed */

	error = scsiread(short scsi_id, ulong block, void *addr);
	/* read block "block" of scsi device "scsi_id" into "addr" */

	error = scsiwrite(short scsi_id, ulong block, void *addr);
	/* write block at "addr" to block "block" of "scsi_id" */

	I am currently simulating this in a test program under AmigaDOS
	using the SCSI-Direct interface, but of course no AmigaDOS
	.devices are around under Minix, so some hardware-level code
	is needed.

	Would anyone who has code for the three functions above
	(preferably C, but well-commented assembly would be OK) for the
	GVP series II (or any other HD controller for that matter),
	please send it to me? Thanks!

------///------------------------------------------------------------
     /// Tyler "Ty" Sarna            E-Mail: tsarna@polar.bowdoin.edu 
 \\\///  "...and save up to 100% on brands you've never heard of!!!!"
--\XX/---------------------------------------------------------------