Motorola MVME162P-242, Installation And Use Manual

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Startup and Operation
2
!
Caution
Although you can use streaming tape to autoboot, the same
power supply must be connected to the tape drive, the
controller, and the MVME162P2. At power-up, the tape
controller will position the streaming tape to the load point
where the volume ID can correctly be read and used.
However, if the MVME162P2 loses power but the controller
does not, and the tape happens to be at load point, the
necessary command sequences (attach and rewind) cannot be
given to the controller and the autoboot will not succeed.
ROMboot
As shipped from the factory, 162Bug occupies an EPROM installed in
XU2. This leaves the remaining EPROM socket (XU1) and the Flash
memory available for your use.
Note
You may wish to contact your Motorola sales office for
assistance in using these resources.
The ROMboot function is configured/enabled via the ENV command
(refer to Chapter 3) and is executed at power-up (optionally also at reset).
You can also execute the ROMboot function via the RB command,
assuming there is valid code in the memory devices (or optionally
elsewhere on the board or VMEbus) to support it. If ROMboot code is
installed, a user-written routine is given control (if the routine meets the
format requirements).
One use of ROMboot might be resetting the SYSFAIL
∗
line on an
unintelligent controller module. The NORB command disables the
function.
For a user’s ROMboot module to gain control through the ROMboot
linkage, four conditions must exist:
❏
Power has just been applied (but the ENV command can change this
to also respond to any reset).