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ROMboot
http://www.motorola.com/computer/literature
2-9
2
ROMboot
As shipped from the factory, 167Bug occupies the first quarter of the
EPROM in sockets XU1 and XU2. This leaves the remainder of XU1 and
XU2 storage and EPROMs XU3 and XU4 available for your use.
Note
You may wish to contact your Motorola sales office for
assistance in using these resources.
The ROMboot function is configured/enabled via the ENV command
(refer to Chapter 3) and is executed at power-up (optionally also at reset).
You can also execute the ROMboot function via the RB command,
assuming there is valid code in the memory devices (or optionally
elsewhere on the board or VMEbus) to support it. If ROMboot code is
installed, a user-written routine is given control (if the routine meets the
format requirements).
One use of ROMboot might be resetting the SYSFAIL
∗
line on an
unintelligent controller module. The NORB command disables the
function.
For a user’s ROMboot module to gain control through the ROMboot
linkage, four conditions must exist:
1. Power has just been applied (but the ENV command can change
this to also respond to any reset).
2. Your routine is located within the MVME167P EPROM memory
map (but the ENV command can change this to any other portion
of the onboard memory, or even offboard VMEbus memory).
3. The ASCII string "BOOT" is found in the specified memory
range.
4. Your routine passes a checksum test, which ensures that this
routine was really intended to receive control at power-up.
For complete details on using the ROMboot function, refer to the
Debugging Package for Motorola 68K CISC CPUs User’s Manual listed
in
Appendix E, Related Documentation
.
Содержание MVME167P
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