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Debugger General Information
Network Boot
3
Restarting the System
3-10
Network Auto Boot is a software routine contained in the 162Bug
Flash/PROM that provides a mechanism for booting an operating
system using a network (local Ethernet interface) as the boot device.
If enabled (via
ENV
Boot routine automatically scans for 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. (Refer to Appendix C
for default LUNs.)
At powerup, if Network Boot is enabled and the controller and
device LUNs are valid, the following message is displayed at the
system console:
Network Boot in progress... To abort hit <BREAK>
Following this message there is a delay to let you 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 Network Boot, you can press the
<BREAK> key or the software
Network Auto Boot is controlled by parameters contained in the
and
commands. These parameters allow the selection of
NIOT
ENV
specific boot devices, systems, and files, and allow programming of
the Boot delay. Refer to the
details.
You can initialize the system to a known state in three different
ways: reset, abort, and break. Each has characteristics which make
it more appropriate than the others in certain situations.
— refer to Appendix A), the Network Auto
or
ABORT
command in Appendix A for more
ENV
switches.
RESET
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