Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!um-math!hyc
From: hyc@math.lsa.umich.edu (Howard Chu)
Newsgroups: comp.os.minix
Subject: Re: Hard disk hassles + minix.img format problem
Message-ID: <496@stag.math.lsa.umich.edu>
Date: 27 Nov 88 14:38:11 GMT
References: <5515@louie.udel.EDU> <274@lzaz.ATT.COM>
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Reply-To: hyc@math.lsa.umich.edu (Howard Chu)
Organization: University of Michigan Math Dept., Ann Arbor
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In article <274@lzaz.ATT.COM> hcj@lzaz.ATT.COM (HC Johnson) writes:
>3. The stwini.c, as written, cannot handle more than drive 0 on controller 0.
>Changing the NDRIVES to n will not do the job.

I wish I knew what problems you were running into... I've just built a new
kernel with NDRIVES set to 4, and I can access my additional drives fine.
(Granted, I only have TOS partitions on the other drive... And by the way,
thanks very much for posting that fixed tos.c. It makes using Minix without
a serial driver so much more livable...)

Of course, I think there's something a bit flaky with the hard disk naming
scheme... Here's a little script I wrote to create hard drive entries in /dev,
in what I think is a better style...

::::::::::::::::::::::::::::::::
#!/bin/sh
# Run with arg1 as number of drive to create.  -- hyc
N=$1
M=`expr $N '*' 8`
for I in 0 a b c d e
do
J=hd${N}$I; echo $J
mknod $J b 3 $M; chmod 600 $J
mknod r$J c 3 $M; chmod 600 r$J
M=`expr $M + 1`
done
::::::::::::::::::::::::::::::::

As you can see, it loops over "0 a b c d e" for minor numbers 0-5. I omit
6 and 7 since they don't do anything right now... All it does is create
special files named, e.g., hd0a instead of hd1. Makes it easier to keep
track of multiple drives, I think. (I have two SCSI drives with embedded
controllers, so my system has hd0? and hd2? ... Is there any way to add
another drive to one of these Miniscribe embedded controllers?)
--
  /
 /_ , ,_.                      Howard Chu
/ /(_/(__                University of Michigan
    /           Computing Center          College of LS&A
   '              Unix Project          Information Systems