Path: utzoo!utgpu!water!watmath!clyde!ima!bbn!clsib21!peter
From: peter@clsib21.UUCP (Peter Craine)
Newsgroups: comp.sys.sequent
Subject: Re: Third Party Disc Experience on Sequ
Summary: all the source you need is there.
Message-ID: <925@clsib21.UUCP>
Date: 5 Oct 88 20:41:38 GMT
References: <1049@orion.cf.uci.edu> <2400024@kailand>
Organization: CLSI  Newtonville, Mass
Lines: 26

> 
> One problem (detailed in a talk given by Purdue University at the 1987
> Sequent User's Group meeting) is that the disk format programs Sequent
> delivers has the drive parameters hard coded in, instead of reading them from
> a user-editable table.  So even if you know all the information that the format
> program needs, you need the *source* code to be able to add drives.  This
> eliminated any chance we had for adding non-supported drives.
> 

Yes, you need some source, but the only source you need is in the
distribution kits.  There are five files to modify:
		/sys/stand/conf_zd.c
		/sys/zdc/zdc.h
		/sys/conf/conf_zd.c
		/sys/conf/controller.balance (only potentially)
		/etc/disktab

The real problem is not having the source, but understanding what must be
changed/added to support the drives.  In particular, /sys/stand/conf_zd.c
is the "non-trivial" portion of adding support I alluded to in my
previous posting.

So, you don't need any more source, but this doesn't make the problem any
less severe.

				Peter Craine