Dear SCO Customer,

Support Level Supplement (SLS) PTF7071A, the UnixWare 7.0.0 io Driver Patch
corrects a problem where, if a system with more than 4Gb of physical memory
is configured to use the memory above 4Gb, there may be random memory
corruption.  This is due to the way 36-bit physical addresses are handled
in the io driver.   SLS PTF7071A contains a replacement io driver.

Note:  For systems running UnixWare 7.0.1, this solution is provided by
       SLS PTF7038C, the UnixWare 7.0.1 Patch for Multiple Drivers, Autopush,
       and Header Files.

SLS PTF7071A contains the following files:

        /etc/conf/pack.d/io/Driver_atup.o
        /etc/conf/pack.d/io/Driver_mp.o

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

        /var/sadm/pkg/ptf7071/install/ptf7071.txt


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

The SLS package PTF7071A should only be installed on: 

        UnixWare 7.0.0 with the UnixWare 7 Release Supplement (uw7rs)


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

1. Download the ptf7071a.Z and ptf7071a.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/ptf7071a.Z
        # pkgadd -d /tmp/ptf7071a
        # rm /tmp/ptf7071a

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 ptf7071

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.