RELIANCE 45C207 Redundant output card

As shipped from the factory, 172Bug occupies an EPROM installed in socket XU2. This leaves one socket (XU1) and the Flash memory 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 MVME172LX Flash/PROM 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.❏ Your routine passes a checksum test, which ensures that this routine was really intended to receive control at powerup.

Network Boot

 Network Auto Boot is a software routine contained in the 172Bug 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 boot media is found or until 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.)

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