DP256 - DP512 Transition

Hello All.

I have recently started to upgrade an old board that uses DP256B's with
DP512. I managed to program the board a couple of days ago with no issues.

Today, I ran into a problem with my application code - it couldn't write
to paged flash when downloading data from my PC app. This was quickly
identified as a problem with the bank select in my flash loading routine.

However no matter how hard I try today, I cannot get a P&E Multilink to
load my original binary back into the chip. Most of the time I get "ELF
Loader Error - Unable to program 00C000-00C200". Sometimes this is
different - its all a bit flaky. I have tried two different pods, two
different boards with the same results. An original board with a DP256
works fine.

I have tried using DP512 as the drivative in ICD12 as well as DP256 -
neither makes any differences.

Finally, I find that communications is frequently lost with the board
after the programming failure. Thinking it could be a hardware problem I
have changed crystals and reset chips to no avail.

I think I have had all these problems before and they just seem to go
away. Naturally they come back when under most pressure ;). My previous
questions to the group on similar topic related to Quad Core machines.

Has anyone got any suggestions where I can start looking?


Jonathan Masters