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Hi Mark.
I think you definitely have a problem with the Nios 2 bootloader.
I'd recommend you check the hex file and possibly regenerate it from the source files.
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Yeah, I wondered the same thing. The project was from scratch, so there's no old cruft in there. However, just to be sure I wrote a little program to read back the bootloader bytes from the EPCS component. It matches byte for byte with the ciii hex file in the Quartus directory, so is good I think.
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I attach for your convenience my CIII bootloader file. It should work for you, too.
Execute a fpga MIF update, flash into epcs and let me know if this solves your problem.
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Thanks. I'll give it a go.
Mark.
Honored Contributor
