Dear SCO Customer,

Support Level Supplement (SLS) PTF3387, the Pentium Pro MCE Handling and
Reporting Supplement, corrects a number of problems related to the handling 
of Machine Check Exceptions (MCEs).

SLS PTF3387 corrects these problems:

1. MCE status registers were not cleared at boot time.  Clearing these
   registers is normally a function of the BIOS, but some systems do not
   implement this function.  These registers are now cleared at system
   startup to enable MCEs to be handled correctly.

2. Restartable MCEs were not being logged correctly.  These are now
   logged in /usr/adm/log/osmlog along with all other MCEs.

3. Some Pentium Pro processors experience a rare spurious Machine Check
   condition which is documented in Intel's Pentium Pro Processor
   Specification Update as Erratum #59. This gives details of a workaround
   which should be applied to the BIOS.  On systems that do not implement
   this workaround an equivalent workaround can be enabled by editing:

        /etc/conf/pack.d/svc/space.c

   and changing the last line in the file from:

        boolean_t p6_erratum59_workaround = B_FALSE;

   to:

        boolean_t p6_erratum59_workaround = B_TRUE;


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

This SLS can be installed on these releases:

    SCO UnixWare Application Server Release 2.1.0, 2.1.1, 2.1.2, 2.1.3
    SCO UnixWare Personal Edition Release 2.1.0, 2.1.1, 2.1.2, 2.1.3


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

1. Download the ptf3387 and ptf3387.txt files to the /tmp directory
   on your machine.

2. As root, add the package to your system using these commands:

       $ su
       # pkgadd -d /tmp/ptf3387

3. Reboot the system after installing this package.


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

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

       $ su
       # pkgrm ptf3387

2. Reboot the system after removing this package.


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

We appreciate your business.

SCO Support Services