User`s manual

General Information
1-31
1
Network I/O Error Codes
PPCBug returns an error code if an attempted network operation is
unsuccessful. Refer to Appendix H for an explanation of network
I/O error codes.
Multiprocessor Support (Remote Start)
The PowerPC board dual-port RAM feature makes the shared
RAM available to remote processors as well as to the local
processor. This can be done by the following method. This method
can be enabled/disabled by the ENV command as its Remote Start
Switch method.
Note PPCBug runs in single processor operation only.
Refer to Chapter 3 for information on setting the ENV command
parameters.
Multiprocessor Control Register (MPCR) Method
A remote processor can initiate program execution in the local
PowerPC board dual-port RAM by issuing a remote GO command
using the Multiprocessor Control Register (MPCR). MPCR contains
one of two words used to control communication between
processors. The location of MPCR is calculated as local RAM size
minus $1C000. 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:
* N/A N/A N/A (MPCR)
NUL ($00) Wait; the initialization is not yet complete
E ($45) Code pointed to by the MPAR address is executing