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Parallella Community • View topic - A couple of questions

A couple of questions

Any technical questions about the Epiphany chip and Parallella HW Platform.

Moderator: aolofsson

A couple of questions

Postby ethereal » Sun Jun 07, 2015 3:33 am

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Re: A couple of questions

Postby piotr5 » Sun Jun 07, 2015 7:47 am

+1 although it isn't that important to me, I'd like to know these things too. however, the docs are complete in terms of listing all possibilities -- to find out the capabilities you'd have to try out all the possibilities on your own. please do so. there's no way such software-experiments could destroy your board (and I bet if there is, then just for discovering that bug adapteva would give you a new board).

also you should read the zync-arm-docs (not provided on the adapteva site afaik). epiphany naturally cannot trigger anything on arm because technically it's just some hardware attached to fpga and during creation of the arm-processor the epiphany never was part of the design. however, maybe in the zync-arm-docs you could find a way how fpga or memory-writes could trigger something on arm anyway. and if there isn't. definitely there is such a possibility in fpga and you just need to code it there. so, please stay curious and explore!
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Re: A couple of questions

Postby sebraa » Sun Jun 07, 2015 4:56 pm

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Re: A couple of questions

Postby ethereal » Mon Jun 08, 2015 2:26 am

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Re: A couple of questions

Postby sebraa » Mon Jun 08, 2015 1:10 pm

I'm not sure about the DMA stuff.

On the other hand, there will be ways to signal the ARM from the Epiphany, but that is not ready yet. By abusing evil tricks, it might be possible to implement that currently, but it would be fragile to say the least.
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Re: A couple of questions

Postby ethereal » Wed Jun 10, 2015 7:40 pm

Just a quick note in case anyone ever comes across this while looking for the same information I was --- you can indeed remotely trigger a message interrupt on a target's core.

- ethereal
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