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From: dannyb@kulcs.UUCP (Danny Backx)
Newsgroups: comp.unix.xenix,comp.unix.wizards,comp.unix.questions
Subject: Some questions...
Keywords: XENIX boot,reconfiguration,fixed disk access
Message-ID: <1117@kulcs.UUCP>
Date: 20 Jan 88 08:59:00 GMT
Organization: Kath.Univ.Leuven, Comp. Sc., Belgium
Lines: 65

I have a few questions concerning XENIX.
We are running XENIX System V on a genuine IBM AT, equiped with two 30Mbyte
fixed disks, and 2.5Mbytes of RAM.

My first question is on that second disk, which was only recently installed.
When XENIX boots, at some point the following is displayed :

| 		The IBM Personal Computer XENIX
| 			Version 2.00
| 		(c) Copyright IBM Corp. 1984, 1985
| 	(c) Copyright Microsoft Corp. 1983, 1984, 1985
| 
| Reserved Memory = 2K
| Kernel Memory = 176K
| Buffers = 100K
| User Memory = 2282K
| bad signature (B66D) on drive 1
| 
| Type Ctrl-d to proceed with normal startup,
| (or give root password for system maintenance):_
| 

My question is now : what does the BAD SIGNATURE message really mean,
and how do I get this fixed.
I must say that the second disk is not currently in use for XENIX,
(or anything), so we just put one large DOS partition on it for testing.
It seems to work just fine.
Also, the diagnostics program on the diagnostics diskette delivered with
the AT shows no errors.


My second question concerns the configuration of the XENIX kernel.
We are using the XENIX system as a development system for network drivers.
This means we are adding several device drivers to it, (for PCnet, ethernet,
and in the near future Token Ring), and we are currently adding gateway
software to the system.

Now we also use some XENIX System III (which is XENIX 1.) systems,
om which the same software is added.

What I'd like to know more about is the kernel memory assignment.
In the configuration files, a lot of parameters are set, concerning
things such as kernel buffers for IPC, and for disk access (if I recall
correctly).

Does anybody know what these parameters exactly mean ?
We don't use the IPC facilities such as messages or shared memory.
Do you know a way to get the buffers for these things out of our new
kernels ?
Basically : is it safe to put a zero value for some of these
'tunable parameters' ?

Please mail your answers directly to me.
I will summarize on the net.

Thanks everybody.

	Danny

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 Danny Backx                            |  mail: Katholieke Universiteit Leuven 
 Tel: +32 16 200656 x 3537              |        Dept. Computer Science
 E-mail: dannyb@kulcs.UUCP              |        Celestijnenlaan 200 A
         ... mcvax!prlb2!kulcs!dannyb   |        B-3030 Leuven
         dannyb@kulcs.BITNET            |        Belgium