2nd HD-Controller

[Patrick Guelat]

Hi there,

I would like to thank everybody who sent us ideas, pointers and hints
on how to use a second hd-controller with sco xenix 2.3.1.

Many thanks to Paul Zola (paulz at sco.uucp), Martin Stanley (mts at ai.toronto.edu),
Jim O'Connor (jim at tiamat.fsc.com) and a lot of others for their precious
help.

What has to be done
-------------------
If you want to install a second hd-controller you should look around for
a hd-only controller ( without floppydisk-controller ). 
In our case this is a TNC RLL-controller, but an Adaptec 2370 would also
work and there are certainly a few more. ( also ST506 controllers )

It must be a controller that can be jumpered to a secondary 
IO-address ( 0x170 - 0x177 ).

The second problem is the IRQ. You have to change it from 14 to 15. On a
few controller this can be done with jumpers, we had to do some hardware
hacks ( cut and paste ;-)

Additionally you should change the ROM address of the controller from
0xc800 to 0xcc00 if possible.

After that, you have to configure your xenix :

Run 'mkdev hd 0 1' to install the first drive on the second controller
Run 'mkdev hd 1 1' to install the second drive on the second controller

If you wish to mount these disks in /etc/rc ( you do ey ? ;-) you will
have to edit '/etc/default/filesys'. ( RTFM for more infos about that )

Be sure that the tunable kernel parameter 'NDISK' is set high enough
( 4 or 5 if you wish to use 4 HD's and a floppy ). This can be done
with /usr/sys/conf/configure.

If you have two hard disks on the second controller, it is necessary
to mount the filesystems on the first hard disk before mounting the
filesystems on the second hard disk.

 --- Patrick Guelat
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