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M32R Debugger and Trace 9 Troubleshooting

Troubleshooting

SYStem.Up Errors

The SYStem.Up command is the first command of a debug session where communication with the target is

required. If you receive error messages while executing this command this may have the following reasons.

• The JTAG lines are not connected correctly.

• The target has no power.

• The pull-up resistor between the JTAG[VCCS] pin and the target VCC is too large.

• The target is in reset:

The debugger controls the processor reset and use the RESET line to reset the CPU on every

SYStem.Up. Therefore no external R-C combination or external reset controller is allowed.

• There is logic added to the JTAG state machine:

By default the debugger supports only one processor in one JTAG chain. If the processor is only

one member of a JTAG chain the debugger has to be informed about the target JTAG chain

configuration. Use the SYStem.CONFIG command to specify the position of the device in the

JTAG-chain.

• There are additional loads or capacities on the JTAG lines.

Memory Access Errors

After system up is completed successfully, data can be written to or read from memory. Trying to access

memory not belonging to the memory map of the processor will be refused with the error message

and

When a unrecoverable bus error occurs the target processor has to be reset.

no memory mapped at address D:XXXXXXXX

bus error generated by CPU

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