ICS TRIPLEX T8913 Channel contact module

BO is used to load an operating system or control program from disk into memory and give control to it. Where to find the program and where in memory to load it is contained in block 0 of the Device LUN specified. (Refer to Appendix D.) The device configuration information is located in block 1 (Appendix D). The device and controller configurations used when BO is initiated can be examined and changed via the I/O Teach (IOT) command. Upon the retrieval of the device configuration information (located in block #1 of the device), the boot process will examine the ENV flag parameter "Ignore CFGA Block on a Hard Disk Boot". Depending on the state of the flag, the boot process will either reconfigure the device or not. If the flag is set to "Y", the reconfiguration process will not be done .

In older devices (e.g., ESDI, ST506, Winchester)

 the reconfiguration of the hard disk drive was necessary. With all the Motorola-tested SCSI hard disk drives, this reconfiguration is not necessary A device probe with entry into the device descriptor table is done whenever a specified device is accessed via BO. The device probe mechanism utilizes the SCSI commands "Inquiry" and "Mode Sense". If the specified controller is non-SCSI, the probe simply returns a status of "device present and unknown". The device probe makes an entry into the device descriptor table with the pertinent data. After an entry has been made, the next time a probe is done it simply returns with "device present" status (pointer to the device descriptor).

The following sequence of events occurs 

when BO is invoked: 1. Block 0 of the Controller LUN and Device LUN specified is read into memory. 2. Locations $F8 (248) through $FF (255) of block 0 are checked to contain the string "MOTOROLA". If it is not found, the boot sequence aborts and displays an error message: Bad VID Block. 3. The following information is extracted from block 0: $90 (144) - $93 (147): Configuration area starting block. $94 (148) : Configuration area length in blocks. If any of the above two fields is zero, the present controller configuration is retained; otherwise the first block of the configuration area is read and the controller reconfigured.

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