ICD-U64 with 18F97J94 debug and diag verify fails

[peterpanic]

Trying to bring up a new 18F97J94 project. Wrote trivial code and tried to run it under debug. I get a box pop up called "Verification Results" which tells me that addresses 200040 to 20027C fail. As my code is only about 400 bytes, what are those high addresses all about?

Ran CCSLOAD and went to diagnostic tab. Software and Firmware are latest (5.021 and 3.13, Hardware is Rev2). Device ID is correct, Vdd is ok.
Clicked on "Test oscillator and debugger" after setting Osc Config to 8MHz internal, and the right-hand pane says
Debugger test
Fail - unable to load a test program into the target chip
Details: Verify Error

and if I click "Test osc..." again, I get
PLEASE WAIT
in the right-hand pane forever

Clearly something is wrong, but I'm stuck as to what I should be looking at.
_________________
- peter -

[PCM programmer]

I don't have the ICD-U64, but look at Sections 4.2 and 4.3 in the
Microchip ICD3 user's guide. It gives a lot of things to try, or to look at:
http://ww1.microchip.com/downloads/en/DeviceDoc/50002081B.pdf

[peterpanic]

Thanks - that is a good list of easy-to-make mistakes.

This is not quite "won't work" but seems to be "user code runs fine, but debug fails", and that appears to be because the debugger tries to place some of its own code above 0x100000.

I thought I might use CCSLOAD to read the chip, modify some bytes above 100000 and write it back to see what happens, but CCSLOAD doesn't rewrite the hex file correctly (the address field for every record is 0).

Looks like I'll have to buy some maintenance...
_________________
- peter -