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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.