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Startup and Operation
A delay follows this message so that you can abort the Autoboot process if
2
you wish. Then the actual I/O begins: the program designated within the
volume ID of the media specified is loaded into RAM and control passes
to it. If you want to gain control without Autoboot during this time,
however, you can press the <BREAK> key or use the
switches on the front panel.
The Autoboot process is controlled by parameters contained in the ENV
command. These parameters allow the selection of specific boot devices
and files, and allow programming of the Boot delay. Refer to the ENV
command description in Chapter 3 for more details.
Although you can use streaming tape to autoboot, the same power supply
!
must be connected to the tape drive, the controller, and the MVME172P4.
At power-up, the tape controller will position the streaming tape to the load
Caution
point where the volume ID can correctly be read and used.
However, if the MVME172P4 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, 172Bug occupies the first quarter of Flash
memory. This leaves the remainder of the Flash memory and the EPROM
socket (XU1) available for your use.
Note
The ROMboot function is configured/enabled via the ENV command
(refer to Chapter 3) and is executed at power-up (optionally also at reset).
2-10
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You may wish to contact your Motorola sales office for
assistance in using these resources.
Computer Group Literature Center Web Site
or
ABORT
RESET
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