Dear SCO Customer,

Support Level Supplement (SLS) PTF4019A, the SCO UnixWare 2.1.3 pcmp Driver,
addresses a problem of a system panic on an SCO UnixWare 2.1.3 operating
system with OSMP is installed.  The panic may read:

          PANIC: vfs_mountroot: cannot mount root

SLS PTF4019A modifies pcmp_irq_lookup() and changes the PCI bus defaults to
AV_POLOW/AV_LEVEL. 

SLS PTF4019A contains:
 
          /etc/conf/pack.d/pcmp/Driver_mp.o


The release notes displayed prior to installation can be found in:

          /var/sadm/pkg/ptf4019/install/ptf4019.txt


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

SLS PTF4019A should only be installed on these releases:

        SCO UnixWare Application Server 2.1.3
        SCO UnixWare Personal Edition 2.1.3

Installation Instructions
-------------------------

1. Download the ptf4019a.Z and ptf4019a.txt files to the /tmp directory on
   your machine.

2. As root, uncompress the file and add the SLS package to your system
   using these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf4019a.Z
        # pkgadd -d /tmp/ptf4019a
        # rm /tmp/ptf4019a

3. Reboot the system after installing this SLS package.


Removal Instructions
--------------------

1. As root, remove the SLS package using these commands:

        $ su
        Password: <type your root password>
        # pkgrm ptf4019

2. Reboot the system after removing this SLS package.


If you have questions regarding this SLS, or the product on
which it is installed, please contact your software supplier.