Asymmetric multiprocessing (AMP)

[zephyrbot]

Reported by Anas Nashif:

Add support for AMP on multi core systems where Zephyr will run side by side with a different OS like Linux or where we have 2 instances of zephyr running on two individual cores serving different tasks.

(Imported from Jira ZEP-1604)

[zephyrbot]

by XiaoHua Yang:

Reference resources：https://github.com/OpenAMP
http://www.rt-thread.org/page/45.html
https://github.com/RT-Thread/rt-thread

[nashif]

See

• https://github.com/codeauroraforum/rpmsg-lite
• https://github.com/EmbeddedRPC/erpc
• https://www.youtube.com/watch?v=T-Qamm11UfI
• http://events.linuxfoundation.org/sites/events/files/slides/NOVAK_CERVENKA.pdf

[galak]

I've asked @wjliang to get a build integration of OpenAMP & libmetal for Zephyr. We intend to than look at code size to be similar to rpmsg-lite.

https://github.com/OpenAMP/open-amp
https://github.com/OpenAMP/libmetal

[carlescufi]

@skordal @ioannisg FYI

[skordal]

I have been looking a little into the differences between OpenAMP and RPMsg-Lite, while working with the two libraries. Some thoughts about each of them:

OpenAMP

• Seems to be targeted mostly at applications where Linux is run on the host processor
• Provides functionality to manage remote processors (load firmware, boot remote processor, etc)
• Requires that a shared resource table is set up between the processors
• Uses heap memory, allocates several large structures on the heap
• Dependent on libmetal as OS/RTOS abstraction layer, in addition to implementation of platform-specific operations for each processor

RPMsg-Lite

• Simplified/reduced API and feature set compared to OpenAMP
• Provides an API that allows static allocation of instance structs (some heap is still used for semaphores)
• Has separate abstraction layers for environment (must be ported for each) and platform
• In my tests, produced smaller compiled code than OpenAMP

[nashif]

in 1.12 now

[Jeepgoing]

hi all,
i am now using nxp lpc54102, have we support this chip in the future? lpc54114's flash is 256k, i need mcuboot+parameter storage+m4 image+m0 image, i think it is difficult to OTA. lpc54102 have 512k flash, i can design application program more easily with it.