Network Boot; Network Boot Sequence; Memory Maps - Motorola MVME167 Series Installation Manual

Debugger General Information
Requirement ...
Power must have just been
applied.
4
Your routine must be located
within the MVME167 ROM
memory map.
The ASCII string ÒBOOTÓ must be located within the speciÞed memory range.
Your routine must pass a checksum test, which ensures that this routine was really
intended to receive control at powerup.

Network Boot

Network Boot Sequence

4-8
For a user's ROMboot module to gain control through the
ROMboot linkage, four requirements must be met:
Optionally, with the ENV command ...
Change this to respond to any reset.
Change this to any other portion of the onboard
memory, or even offboard VMEbus memory.
For complete details on how to use ROMboot, refer to the
Debugging Package for Motorola 68K CISC CPUs User's Manual.
Network Auto Boot is a software routine contained in the 167Bug
EPROMs that provides a mechanism for booting an operating
system using a network (local Ethernet interface) as the boot device.
1. 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.
2. 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.)