TECHNICAL INFORMATION DOCUMENT

TITLE:              PTF2014 - PCMP Driver Upgrade for MP Systems
DOCUMENT ID:        TID300203
DOCUMENT REVISION:  A
DATE:               10APR95
ALERT STATUS:       Yellow
INFORMATION TYPE:   Symptom Solution
README FOR:         tf2014    

PRODUCT and VERSION:
UnixWare 2.0

ABSTRACT:

Level-sensitive interrupts on non-EISA MP Machines are now properly 
programmed as level-sensitive interrupts and the system will nolonger 
lockup. The PCMP driver was modified to share IRQ 13 with other 
peripherals so that the other device will receive its interrupts.

SYMPTOM

Level Triggered Interrupts not handled properly on non-EISA MPS Machines.

SOLUTION

Apply the tf2014 file.


Installation Instructions:  

DATATYPE: datastream

1.  Download the tf2014.Z and tf2014.txt files to the /tmp directory
    on your machine.

2.  Read the release notes contained in this file and follow the
    instuctions to add the packages to your system.

3.  Now become root, uncompress the file and add the package to your 
    system using the following commands:

        $ su
        # uncompress /tmp/tf2014.Z
        # pkgadd -d /tmp/tf2014

Solution Specifics

Version
-------
1.0

Date
----

30MAR95

Information Type
----------------

Symptom Solution


Product And Version
--------------------

UnixWare 2.01

Abstract
--------

Level Triggered Interrupts not handled properly on non-EISA MPS Machines.

Symptom
--------

1)  On non-EISA bus systems interrupts which should be level-sensitive
    are not being correctly programmed.  They are programmed as
    edge-triggered interrupts.  This mainly effects PCI/ISA when
    you share interrupts on the PCI peripherals.  The symptoms
    are that interrupts are sometimes lost when both peripherals
    sharing the IRQ are being used and the system locks up.

2)  The sharing of IRQ 13 between the PCMP driver and other peripherals
    was not correctly handled.  This would only occur when someone
    set a level sensitive peripheral to IRQ 13 (which is probably rare).
    The symtoms are that the device will not get interrupts.


General Description.
-------------------

Level-sensitive interrupts on non-EISA MP Machines are now properly
programmed as level-sensitive interrupts and the system will nolonger
lockup.  The PCMP driver was modified to share IRQ 13 with other
peripherals so that the other device will receive its interrupts.


New Features.
------------

NA

Software Notes and Recommendations.
----------------------------------

This patch should only be installed on UnixWare 2.01 MP Systems
which already have the PCMP Driver installed.


Testing of the modified software contained in this package has been
conducted only to the extent necessary to confirm that it resolves the
problem(s) stated above ("Symptom").  Such testing consists of
recreating the problem conditions and verifying that the problem no 
longer occurs.  No other testing of this software has been done.

Hardware Notes and Recommendations.
----------------------------------

This PTF is targeted for i486 and Pentium MP Systems using a non-EISA Bus
Architecture.

Installation Instructions.
-------------------------

This PTF consists of 1 3.5 inch floppy.  Insert the floppy into the drive
and, while logged in as root, type

     pkgadd -d diskette1

and follow the instructions output by pkgadd.


Most of the information you need is provided in the documentation and in the
online help facility.