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MVME55006E Single-Board Computer Installation and Use (6806800A37D)
MOTLoad Firmware Remote Start
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4.6 Remote Start
As described in the MOTLoad Firmware Package User's Manual, listed in Appendix C, Related
Documentation, remote start allows the user to obtain information about the target board,
download code and/or data, modify memory on the target, and execute a downloaded program.
These transactions occur across the VMEbus in the case of the MVME5500. MOTLoad uses
one of four mailboxes in the Universe II as the inter-board communication address (IBCA)
between the host and the target.
CR/CSR slave addresses configured by MOTLoad are assigned according to the installation
slot in the backplane, as indicated by the VME64 Specification. For reference, the following
values are provided:
CR/CSR space for a board in the 1st slot will start at 0x0008.0000
CR/CSR space for a board in the 2nd slot will start at 0x0010.0000
CR/CSR space for a board in the 3rd slot will start at 0x0018.0000
CR/CSR space for a board in the 4th slot will start at 0x0020.0000
CR/CSR space for a board in the 5th slot will start at 0x0028.0000
CR/CSR space for a board in the 6th slot will start at 0x0030.0000
CR/CSR space for a board in the 7th slot will start at 0x0038.0000
CR/CSR space for a board in the 8th slot will start at 0x0040.0000
CR/CSR space for a board in the 9th slot will start at 0x0048.0000
CR/CSR space for a board in the ath slot will start at 0x0050.0000
CR/CSR space for a board in the bth slot will start at 0x0058.0000
CR/CSR space for a board in the cth slot will start at 0x0060.0000
For further details on CR/CSR space, please refer to the VME64 Specification, listed in
Appendix C, Related Documentation.
The MVME5500 uses a Tundra Universe II for its VME bridge. The offsets of the mailboxes in
the Universe II are defined in the Universe II User Manual, listed in Appendix C, Related
Documentation, but are noted here for reference:
Mailbox 0 is at offset 7f348 in the CR/CSR space
Mailbox 1 is at offset 7f34C in the CR/CSR space
Mailbox 2 is at offset 7f350 in the CR/CSR space
Mailbox 3 is at offset 7f354 in the CR/CSR space
The selection of the mailbox used by remote start on an individual MVME5500 is determined
by the setting of a global environment variable (GEV). The default mailbox is zero. Another GEV
controls whether remote start is enabled (default) or disabled. Refer to the Remote Start
chapter in the MOTLoad Firmware Package User's Manual for remote start GEV definitions.
The MVME5500’s IBCA needs to be mapped appropriately through the master’s VMEbus
bridge. For example, to use remote start using mailbox 0 on an MVME5500 installed in slot 5,
the master would need a mapping to support reads and writes of address 0x002ff348 in VME
CR/CSR space (0x280000 + 0x7f348).