KEBA GVME600SC-B Ethernet module

Although streaming tape can be used to autoboot, the same power supply must be connected to the: ❏ Streaming tape drive ❏ Controller ❏ MVME177 At power-up, the tape controller positions the streaming tape to load point where the volume ID can correctly be read and used. If, however, the MVME177 loses power but the controller does not, and the tape happens to be at load point, the sequences of commands required (attach and rewind) cannot be given to the controller and autoboot will not be successful.

ROMboot 

The ROMboot function is configured/enabled by the Environment (ENV) command (refer to Commands Table at the end of this Appendix) and executes: ❏ At power-up ❏ At reset (optionally) ❏ By the RB command, assuming there is valid code in the EPROMs (or optionally elsewhere on the module 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 command disables the function.

For a user's ROMboot module to gain control 

through the ROMboot linkage, four requirements must be met: ❏ Power must have just been applied (but the ENV command can change this to also respond to any reset) ❏ Your routine must be located within the MVME177 ROM 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” 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 For complete details on how to use ROMboot, refer to the Debugging Package for Motorola 68K CISC CPUs User's Manual.

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