Bringing up the Board
http://www.motorola.com/computer/literature
2-9
2
However, if the MVME177P loses power but the controller does not, and
the tape happens to be at load point, the necessary command sequences
(Attach and Rewind) cannot be given to the controller and the autoboot
will not succeed.
ROMboot
As shipped from the factory, 177Bug occupies the first quarter of the
EPROM in sockets XU1 and XU2. This leaves the remainder of XU1 and
XU2 storage and Flash memory (depending on the setting of S4) 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:
❏
Power has just been applied (but the ENV command can change this
to also respond to any reset).
❏
Your routine is located within the MVME177P EPROM memory
map (but the ENV command can change this to any other portion of
the onboard memory, or even offboard VMEbus memory).
❏
The ASCII string "BOOT" is found in the specified memory range.
Summary of Contents for MVME177P
Page 1: ...MVME177P Single Board Computer Installation and Use V177PA IH1 Edition of October 2000 ...
Page 10: ...x ...
Page 12: ...xii ...
Page 14: ...xiv ...
Page 34: ...1 16 Computer Group Literature Center Web Site Hardware Preparation and Installation 1 ...
Page 48: ...2 14 Computer Group Literature Center Web Site Startup and Operation 2 ...
Page 92: ...C 2 Computer Group Literature Center Web Site Network Controller Data C ...
Page 98: ...D 6 Computer Group Literature Center Web Site Disk Tape Controller Data D ...
Page 108: ...Index IN 6 Computer Group Literature Center Web Site I N D E X ...