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What does nios-run do?

Hello,

I can download a program to memory using "nios-run my_prog.srec" and it works fine.

However, when I write the program into the same memory manually (ie. memory fill command), nios will not wrong the program properly.

I verified that both methods write exactly the same program bytes into memory, but nios-run does something with the memory AFTER the program end. This must be the source of my problems. Why are bytes changed after the end of the program?

I verified every byte up until the last byte written as defined by the S-Record.

Any ideas on what steps nios-run goes through?

Help is greatly appreciated.

Reply to
cruzin
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What are you talking about?

Reply to
fabbl

Maybe a stupid question: How do you run your manually entered program? Are you using the go (G) command in germs? Can you use go to *re-run* the downloaded srec file?

Petter

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Reply to
Petter Gustad

Hi Petter,

I wrote a program to convert an Srec file to a binary file and then downloaded this over a PCI/Avalon bridge.

I have found my problem, which was that I assumed the Srec file was always writing a contiguous memory region, when in fact sometimes addresses are skipped, presumably for alignment optimization.

Reply to
cruzin

If you have a look at the srec spec, I'm fairly sure the first data after the 's' on every line is the address that line starts at.

Nial

------------------------------------------------ Nial Stewart Developments Ltd FPGA and High Speed Digital Design Cyclone based 'Easy PCI' dev board

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Reply to
Nial Stewart

Hi Nial,

Yes you are correct.

When I wrote my Srec-converter program, I looked at a nios-built Srec file, and all records were contiguous. Later on, I realized in some programs, nios-build will skip bytes here and there. Live and learn.

Reply to
cruzin

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