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1991-08-26
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American Megatrends, Inc.
Tech Tip #98.006
01/22/91
Problem:
1. During installation of SCO UNIX Rel. 3.2.0s, 80486 system hangs
when accessing N2 disk.
2. SCO UNIX, all versions, report the presence of a phantom tape
drive, id 0, LUN 0.
Solution 1:
From the point where SCO requests N2 disk, to the point where the
keyboard selection apperas, no extra key must be pressed.
It seems like SCO has not masked out the keyboard interrupt, IRQ1
during that time, and any extra key pressed at that time, causes
the system to hang.
This same problem was observed on an OPTI 486 25MHz motherboard, with
standard IBM Keyboard controller, and non AMI BIOS.
This problem has been seen on the following AMI motherboards:
- Voyager 33MHz/25Mhz
- Enterprise I 33Mhz/25MHz
This is under investigation for 386 motherboards, also SCO will be
informed about this problem.
Solution 2:
This is a well documented problem with SCO UNIX, it should be fixed
in the latter releases of SCO UNIX.
One way to eliminate this problem is:
# mkdev tape
Select option 3, remove a tape drive
Select option 4, remove a SCSI tape drive
Give id=2, lun=0, controller=0
rebuild the kernel
make it the default kernel
# shutdown -g0 -i0 -y, to reboot
- When the UNIX system is rebooted, the phantom SCSI tape should
have been eleminated.
- If some one tries to install a SCSI tape without removing this
phantom tape drive, there could be driver conflicts.