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ROMboot
As shipped from the factory, 162Bug occupies an EPROM installed
in socket XU2. This leaves one socket (XU1) and the Flash memory
available for your use. Contact your Motorola sales office for
assistance. This function is configured/enabled by the
Environment (
at powerup (optionally also at reset) or by the
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 SYSFAIL* on an unintelligent controller module. The
NORB
For a user's ROMboot module to gain control through the ROMboot
linkage, four requirements must be met:
For complete details on how to use ROMboot, refer to the Debugging
Package for Motorola 68K CISC CPUs User's Manual.
) command (refer to Appendix A) and executed
ENV
command disables the function.
Power must have just been applied (but the
can change this to also respond to any reset).
Your routine must be located within the MVME162LX
Flash/PROM memory map (but the
change this to any other portion of the onboard memory, or
even offboard VMEbus memory).
The ASCII string ''BOOT'' must be located within the
specified memory range.
Your routine must pass a checksum test, which ensures that
this routine was really intended to receive control at
powerup.
ROMboot
command
RB
command
ENV
command can
ENV
3
3-9
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