Motorola 700/800-Series User Manual
3-8
Debugger General Information
3
controllers and devices in a specified sequence until a valid
bootable device containing a boot media is found or the list is
exhausted. If a valid bootable device is found, a boot from that
device is started. The controller scanning sequence goes from the
lowest controller Logical Unit Number (LUN) detected to the
highest LUN detected. Controllers, devices, and their LUNs are
listed in Appendix B.
bootable device containing a boot media is found or the list is
exhausted. If a valid bootable device is found, a boot from that
device is started. The controller scanning sequence goes from the
lowest controller Logical Unit Number (LUN) detected to the
highest LUN detected. Controllers, devices, and their LUNs are
listed in Appendix B.
At powerup, Autoboot is enabled, and providing the drive and
controller numbers encountered are valid, the following message is
displayed upon the system console:
controller numbers encountered are valid, the following message is
displayed upon the system console:
Autoboot in progress... To abort hit <BREAK>
Following this message there is a delay to allow you an opportunity
to abort the Autoboot process if you wish. Then the actual I/O is
begun: the program pointed to within the volume ID of the media
specified is loaded into RAM and control passed to it. If, however,
during this time you want to gain control without Autoboot, you
can press the <BREAK> key or the software
to abort the Autoboot process if you wish. Then the actual I/O is
begun: the program pointed to within the volume ID of the media
specified is loaded into RAM and control passed to it. If, however,
during this time you want to gain control without Autoboot, you
can press the <BREAK> key or the software
ABORT
or
RESET
switches.
Autoboot 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
devices and files, and allow programming of the Boot delay. Refer
to the
ENV
command in Appendix A for more details.
!
Caution
Although streaming tape can be used to autoboot, the
same power supply must be connected to the streaming
tape drive, the controller, and the MVME162LX. At
powerup, the tape controller will position the streaming
tape to load point where the volume ID can correctly be
read and used.
same power supply must be connected to the streaming
tape drive, the controller, and the MVME162LX. At
powerup, the tape controller will position the streaming
tape to load point where the volume ID can correctly be
read and used.
If, however, the MVME162LX loses power but the
controller does not, and the tape happens to be at load
point, the sequences of commands required (attach and
rewind) cannot be given to the controller and autoboot
will not be successful.
controller does not, and the tape happens to be at load
point, the sequences of commands required (attach and
rewind) cannot be given to the controller and autoboot
will not be successful.