Dear SCO Customer,

Support Level Supplement (SLS) PTF7079B, the UnixWare 7.0.1 Replacement dlpi
Driver, addresses the problem of panics seen in the mdi_message() due to the
system receiving a packet from the network before the dlpid has rebuilt the
network daemon stream. 

The dlpid will decide to restart the network daemon if it detects that it 
has hung. However, the system can receive a packet from the network before 
the dlpid has rebuilt the network daemon, resulting in a panic.

SLS PTF7079B provides a new dlpi driver that does not allow packets to be
received prior to the network stream being in place. 

Panics seen in the mdi_message() can include:

  PANIC: kernel-mode address fault on user address 0x00000000
 
  Kernel Page fault from (cs:eip) = (00000100:(75C61C3)):
  eax=00000000 ebx=C3159240 ecx=00000000 edx=00A407C7 esi=C187AA40
  edi=C334F580 ebp=0000001C esp=C87D878C
 
  Debugger:
  eax:    0 ebx: C3159240 ecx:    0 edx: 00A407C7 elf:    110246
  esi:C187AA40 edi: C334F480 ebp: 1C esp:C87D878C
 
  mdi_message+123: cmpl $0X00, 0X34(%eax)

SLS PTF7079B also addresses this panic which may occur when using an
Intel Pro100+ Nic card:

         Kernel-mode address fault at ip_sendctl+43


SLS PTF7079B contains this file:

        /etc/conf/pack.d/dlpi/Driver.o


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

SLS PTF7079B should only be installed on:

        UnixWare 7.0.1


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

1. Download the ptf7079b.Z and ptf7079b.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/ptf7079b.Z
        # pkgadd -d /tmp/ptf7079b
        # rm /tmp/ptf7079b

3. Reboot the system after installing this SLS package.

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

        /var/sadm/pkg/ptf7079/install/ptf7079.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf7079

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.