26
SCSI SWITCH (FOR AS/400
®
)
4.3 SCSI Switch Microcode Updates
The SCSI Switch controller may require microcode updates to incorporate
new features and performance enhancements. This can be done by loading a
specially formatted IPL 1/2" microcode tape into the IBM 3490E-11 or IPL
6790E tape drive attached to the SCSI Switch and following these procedures.
The following instructions assume that a 6790E or 3490E is attached to the
tape port of the controller.
1. Unload any tapes in the 6790E or 3490E-11 tape drive and turn
off its power.
2. Power off the SCSI Switch.
3. Put the 6790E or 3490E-11 tape drive into microcode update mode.
To do this:
a) Set the SCSI ID of the 6790E or 3490E tape drive to 0x0f. The ID switch
is located on the back of the tape drive.
b) Change the SCSI ID by pressing either the top or bottom button until
“F” is displayed in the ID window.
c) The tape drive must be power-cycled in order for a new SCSI ID to be
recognized.
4. Power on the tape drive.
5. Once the tape drive displays Not Ready on its front panel, place the
microcode tape in the top slot of the tape loader and press the START
button. Wait for Ready to be displayed on the tape unit’s front panel.
6. Power on the SCSI Switch.
7. The message “Ld uCode” is briefly displayed, then the controller attempts
to read the microcode tape. If no tape is loaded, the message “Ld Tape”
is displayed until a tape is loaded.
a) The SCSI Switch controller will read a special IPL header on the tape
to verify that it is a switch microcode tape.
b) If this is correct, the microcode is read from tape and programmed
into the controller’s flash memory.
c) While reading the tape, the front panel will display Rd Tape.