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Multiprocessor Support
The MVME166 dual-port RAM feature makes the shared RAM available to
remote processors as well as to the local processor. This can be done by either
of the following two methods. Either method can be enabled/disabled by the
ENV command as its Remote Start Switch Method (refer to Appendix A).
Multiprocessor Control Register (MPCR) Method
A remote processor can initiate program execution in the local MVME166
dual-port RAM by issuing a remote GO command using the Multiprocessor
Control Register (MPCR). The MPCR, located at shared RAM location of $800
offset from the base address the debugger loads it at, contains one of two
longwords used to control communication between processors. The MPCR
contents are organized as follows:
The status codes stored in the MPCR are of two types:
Status returned (from the monitor)
Status set (by the bus master)
The status codes that may be returned from the monitor are:
HEX
0
(HEX 00) --
ASCII E
(HEX 45) --
ASCII P
(HEX 50) --
ASCII R
(HEX 52) --
You can only program Flash memory by the MPCR method. Refer to the
.PFLASH system call in the Debugging Package for Motorola 68K CISC CPUs
User's Manual for a description of the Flash memory program control packet
structure.
The status codes that may be set by the bus master are:
ASCII G
(HEX 47)
ASCII B
(HEX 42)
MVME166IG/D2
$800
*
N/A N/A N/A (MPCR)
Wait. Initialization not yet complete.
Code pointed to by the MPAR address is executing.
Program Flash Memory. The MPAR is set to the
address of the Flash memory program control packet.
Ready. The firmware monitor is watching for a change.
--
Use Go Direct (
--
Install breakpoints using the Go (
Multiprocessor Support
GD
) logic specifying the MPAR address.
G
) logic.
3
3-21
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