Q Getting started: NaCl for ARM

[Mike Acton]

Hey guys, 

(Ironically?) since getting my Chromebook, I've not done any NaCl stuff since it's ARM-based. I understand that there's some support for it - Are there two competing solutions (pnacl, nacl/arm)?

Q: What's the best way to get started (or best pages to start reading) to do get NaCl working for ARM?

Thanks,

Mike.

[montonero]

Hi Mike.

I agree - it's totally confusing.

Colt indirectly mentions NaCl for ARM when asked about limitations of Chromebooks:

https://plus.google.com/u/1/105062545746290691206/posts/gbQSkFmFvYt

Thus I guess that's the way to go.

[Mike Acton]

Cool. Thanks.

Colt McAnlisJan 15, 2013

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+Igor M That's old info! Nacl 25 SDK comes complete with ARM toolchain!

It sounds like it should "just work" with Pepper 25.

Mike.

[David Michael]

Right, NaCl is supported for ARM in 25+, particularly on the ARM-based Samsung chromebooks (I don't think there are any other devices that support it yet). But as of right now, you still have to build a separate .nexe for each architecture you target. So to support all platforms where NaCl is available, you'd want to provide an x86-32 .nexe, x86-64 .nexe, and an ARM .nexe.

This allows you to squeeze the most performance you can out of each platform; e.g., if you want to do some custom (validatable) assembly. PNaCl will be a tradeoff where you can get native performance that's perhaps not quite as close to the metal, but you only need to provide one binary.

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[Noel Allen]

To be clear, we have a version of ARM for newlib.  Generally, your could should just recompile.  We are still working on glibc for ARM.

-Noel

[David Sehr]

To expand a little on the answers given by David and Noel, the release notes for M25 refer to the ARM toolchain:

https://developers.google.com/native-client/dev/sdk/release-notes#pepper_25

Enjoy!  And feedback is, of course, always welcome.

David

[Christian Stefansen]

And to follow up: we just published a blog post on the Chromium blog about NaCl support on ARM. http://blog.chromium.org/2013/01/native-client-support-on-arm.html

Christian Stefansen