Is it possible to write pure assembly code for remoteproc?

Nicolas Dammin

Other Parts Discussed in Thread: AM3359, CODECOMPOSER

Hi,

I'm using the AM335X Starter Kit from TI with an AM3359 SoC and I use the TI Processor SDK Linux version 02.00.01.07. I managed to get remoteproc driver working, then I removed the Display module and used the flatflex connector to breakout some GPIOs of PRU1 to hook up some LEDs. I wrote a blink-led firmware in CCS v6 as described in the PRU HandsOn Lab and successfully bootet the PRU1 to let my LEDs blink.

Now I need to write a very fast code so I have to write it in Assembly language. I would like to use the AM335x PRU-ICSS Reference Guide to write my code and use the PASM compiler.

Is it possible to write pure assembler code like with the PASM and make the code work for the newer remoteproc? Or can I write assembly code in CodeComposer Studio with the TI compiler? I couldn't figure out yet how I can do that. Is there a Tutorial somewhere?

Regards

Nico

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

This is the wiki page for the Remoteproc driver: processors.wiki.ti.com/.../PRU-ICSS_Remoteproc_Driver It expects an ELF file.

0 Nicolas Dammin over 9 years ago in reply to Biser Gatchev-XID

Prodigy 120 points

Thanks for your answer. I can read that I need an ELF file and a resource table. But that doesn't answer my question yet. How do I write a suitable code in assembly language and how can I compile it so that I get that .elf which works for the remoteproc driver?

Regards
Nico

0 Joe G. over 9 years ago in reply to Nicolas Dammin

TI__Mastermind 25866 points

Haven't dome this in years but your best bet might be to write C-callable assembly for the PRU.

Please see p. 110 of www.ti.com/.../spruhv7a.pdf

0 Jason Reeder over 9 years ago in reply to Joe G.

TI__Genius 10440 points

Nicolas,

Please see my response on this post: e2e.ti.com/.../1608294

You just need the .resource_table section in your output file to comply with what remoteproc is expecting. The main.asm and AM335x_PRU.cmd file should get you started in the right direction.

Jason

0 Nicolas Dammin over 9 years ago in reply to Jason Reeder

Prodigy 120 points

Thank you very much Jason. That's exactly what I was looking for. This will help me a lot.

Regards

Nico

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Is it possible to write pure assembly code for remoteproc?