Name: MVME147-010
Price: 4654 CNY
Availability: InStock

Description

This information applies to the MVME147. Although streaming tape can be used to autoboot, the same power supply must be connected to the streaming tape drive, controller, and the MVME147. 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 MVME147 loses power but the controller does not, and the tape happens not to be at load point, the sequences of commands required (attach and rewind) cannot be given to the controller and autoboot is not successful.
This function is enabled by the ROMboot (RB) command and executed at power up (optionally also at reset), assuming there is valid code in the ROMs (or optionally elsewhere on the module or VMEbus) to support it. If ROMboot code is installed and the environment has been set for Bug mode (refer to the Set Environment to Bug/Operating System (ENV) section in Chapter 3), a userwritten 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 your module to gain control through the ROMboot linkage, four requirements must be met: 1. Power must have just been applied (but the RB command can change this to also respond to any reset). 2. Your routine must be located within the MVME147 ROM memory map (but the RB command can change this to any other portion of the onboard memory, or even offboard VMEbus memory). 3. The ASCII string “BOOT” must be located within the specified memory range. 4. Your routine must pass a checksum test, which ensures that this routine was really intended to receive control at power up. To prepare a module for ROMboot, the Checksum (CS) command must be used. When the module is ready it can be loaded into RAM, and the checksum generated, installed, and verified with the CS command. (Refer to the CS command description and examples.)
By convention within Motorola, the last three bytes of ROM contain the firmware version number, checksum, and socket number. In this environment, the length would contain the ASCII string “BOOT”, through and including the socket number; however, if you wish to make use of ROMboot you do not have to fill a complete ROM. Any partial amount is acceptable, as long as the length reflects where the checksum is correct. ROMboot searches for possible routines starting at the start of the memory map first and checks for the “BOOT” indicator. Two events are of interest for any location being tested: 1. The map is searched for the ASCII string “BOOT”. 2. If the ASCII string “BOOT” is found, it is still undetermined whether the routine is meant to gain control at power up or reset. To verify that this is the case, the bytes starting from ’BOOT’ through the end of the routine (as defined by the 4-byte length at offset $8) are run through the self-test checksum routine. If both the even and odd bytes are zero, it is established that the routine was meant to be used for ROMboot.

MVME147-010 PDF
MVME147-010

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