What does nios-run do?

C

cruzin

Guest
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.
 
What are you talking about?

"cruzin" <cruiser144@hotmail.com> wrote in message
news:775730eb.0401142320.250e4218@posting.google.com...
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.
Click to expand...
 
cruiser144@hotmail.com (cruzin) writes:

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.
Click to expand...
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?
 
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.


cruiser144@hotmail.com (cruzin) writes:

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.

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
Click to expand...
 
cruzin <cruiser144@hotmail.com> wrote in message
news:775730eb.0401172120.28d24bd6@posting.google.com...
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.
Click to expand...
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
www.nialstewartdevelopments.co.uk
 
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.

cruzin <cruiser144@hotmail.com> wrote in message
news:775730eb.0401172120.28d24bd6@posting.google.com...
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.

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
www.nialstewartdevelopments.co.uk
Click to expand...
 
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