3-8
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Debugger General Information
3
3. The ASCII string "BOOT" must be located within the specified
memory range.
4. Your routine must pass a checksum test, which ensures that this
routine was really intended to receive control at power-up.
For complete details on how to use ROMboot, refer to the Debugging
Package for Motorola 68K CISC CPUs User’s Manual.
Network Boot
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. The Network
Auto 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 power-up, Network Boot is enabled, and providing the drive and
controller numbers encountered are valid, the following message is
displayed upon the system console:
"Network Boot in progress... To abort hit <BREAK>"
Following this message there is a delay to allow you to abort the Auto Boot
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
ABORT or RESET switches.
Network Auto Boot is controlled by parameters contained in the NIOT
and ENV commands. These parameters allow the selection of specific
boot devices, systems, and files, and allow programming of the Boot delay.
Refer to the ENV command in Appendix A for additional information.
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