What does nios-run do?

Question

Hello,I can download a program to memory using "nios-run " andit 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 intomemory, but nios-run does something with the memory AFTER the programend. This must be the source of my problems. Why are bytes changedafter the end of the program?I verified every byte up until the last byte written as defined by theS-Record.Any ideas on what steps nios-run goes through?Help is greatly appreciated.

fabbl · Accepted Answer

What are you talking about?

Petter Gustad · Answer

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-- A: Because it messes up the order in which people normally read text.Q: Why is top-posting such a bad thing?A: Top-posting.Q: What is the most annoying thing on usenet and in e-mail?

cruzin · Answer

Hi Petter,I wrote a program to convert an Srec file to a binary file and thendownloaded this over a PCI/Avalon bridge.I have found my problem, which was that I assumed the Srec file wasalways writing a contiguous memory region, when in fact sometimesaddresses are skipped, presumably for alignment optimization.

Nial Stewart · Answer

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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cruzin · Answer

Hi Nial,Yes you are correct.When I wrote my Srec-converter program, I looked at a nios-built Srecfile, and all records were contiguous. Later on, I realized in someprograms, nios-build will skip bytes here and there. Live and learn.

What does nios-run do?

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