TITLE: TF2145 - Multiple I/O APIC support on MP Specification 1.1 and 1.4 
                 Systems

README FOR: TF2145

PRODUCT and VERSION:    

UnixWare 2.03


Abstract
--------

This PTF contains kernel and idmkunix command updates for support
of Intel MP Multiprocessor Specification Version 1.1 and 1.4
configurations with multiple I/O APICs.

Symptom
--------

When the UnixWare OS Multiprocessor Support package is installed
on Intel MP Specification Version 1.1 and 1.4 systems that have
multiple I/O APICs enabled, the system will panic during start-up
or hang during access to PCI devices.


SOLUTION SPECIFICS
------------------
Installation Instructions:

DATATYPE: datastream

1.  Download the tf2145.Z and tf2145.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 package to your system.

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

        $ su
        # uncompress /tmp/tf2145.Z
        # pkgadd -d /tmp/tf2145

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

When the UnixWare OS Multiprocessor Support package is installed
on Intel MP Specification Version 1.1 and 1.4 systems that have
multiple I/O APICs enabled, the system will panic during start-up
or hang during access to PCI devices.


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

Support for Intel Multiprocessor Specification 1.1 and 1.4 systems
with the second (or higher) I/O APIC enabled is provided.
I/O APIC interrupt assignments are encoded using IRQ values
greater than 15.


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

This PTF can be installed on 2.03 systems which have the OS 
Multiprocessor Support (osmp) package 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 (typically in a
SCO test laboratory) 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 the i386, i486 and Pentium CPU's.