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Altera_Forum
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15 years ago

Strange problem after changing reset vector

Hi, I've been struggling for about one day around a strange problem which appeared after some changes in sopc system. Apart a few minor changes (added 2 pio ports, changed ethernet mac isr pr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I have found that there are 3 scenarios with EPCS when debugging with the USB Blaster, 1 of which, in my experience, leads to flakiness.

1) EPCS is blank.

2) EPCS has the old configuration.

3) EPCS has the new configuration.

I have found scenario 2 leads to flaky behavior. I have also found that scenarios 1 and 2 lead to erratic output of the debug messages in the debugger. Scenario 3 makes things the most stable and how I usually try to run.

This could all be due to our configuration which is a fairly complex TSE-based system. And, this is still using 8.1 Quartus/NIOS II.

Bill