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Altera_Forum's avatar
Altera_Forum
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9 years ago

NIOS II gen 2 not starting when code compiled with O0 optimization

Hi, My code simply does not run if in the BSP settings I leave the default O0 compiler optimization. With O1 and Os it works I have tried. The code starts like this: *leds = 0xFF;...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Yes there is more than enough memory. I resolved this by starting a new project from scratch and copy-pasting the vhdl and the c code.

It is a configuration problem that messes up the project either when you copy it from somewhere (because of absolute paths) or when you upgrade the project from a previous version of Quartus. I am not sure which one - i don't plan to spend more time analyzing this.

What I can confirm is:

1. Problem dissapears when: starting a new project from scratch - new Quartus project, rebuilding the system in qsys, new project in SBT. VHDL code was copy pasted and so were the c code files.

2. Problem dissapears even if I use the nios system as it was in the project that had the problem (hence the problem is not in Qsys system)

3. Problem remains if I recreate the SBT from scratch in the Quartus project with the problem. (of course copy the c-code files)

I really don't like this kind of behaviour of the software - unfortunately altera is not the only having such problems, in fact I would expect any complicated toolchain to have this kind of issues.