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AST RESEARCH, INC. TECHNICAL BULLETIN #0696A 08-16-91
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SCO UNIX BOOT FAILURE WITH MEMORY EXPANSION BOARD
PROBLEM: Under SCO UNIX 3.2 version 2.0, system will hang
intermittently during boot if memory expansion board is
present, AST part number 202387-001.
AFFECTED
SYSTEM BOARDS: All system boards with the following part numbers:
202356-004 and 202360-001
CAUSE: During UNIX installation the software will check for known
devices and will activate a driver for that device. UNIX
mistakenly identifies a device that is not present, and
activates a driver for it. This causes the system to hang,
with the following error message:
WDHA-OUT: command byte 01 rejected
WDHA-OUT: command byte 07 rejected
SOLUTION: The new release of SCO UNIX 3.2 version 3.0 resolves this
problem and is scheduled to be released by SCO in July,
1991.
NOTE: A temporary solution would be to slow the system down
during the boot process, and resume normal speed after
completion of boot sequence, which would be the login
prompt. This can be accomplished by using the <CTRL>
<ALT> <DOWN ARROW> and <CTRL> <ALT> <UP ARROW>
sequence. For further information on speed commands,
please refer to your systems user manual.