topic Re: rtos on A core does not remain active after linux boot in i.MX Processors

rtos on A core does not remain active after linux boot

Ahelion — Tue, 19 Dec 2023 08:57:13 GMT

Hello all,

I have tried the hello_world_ca53 from here: https://www.nxp.com.mcas.ms/docs/en/user-guide/REALTIMEEDGEUG.pdf?McasTsid=11394&McasCtx=4

booting freertos on A core.

(bitbake and gcc-arm example)

on my imx8mp pevk board.

I have followed the steps, put the binary in, after I give it the u-boot => cpu 3 release 0xC0000000

I see this:

Once I give the boot command: u-boot => boot

Linux booting up log appears.

The tic/tac stuff stops.

Once logged into linux and i type "nproc" I can see that the linux only has 3 cores left.

Does anyboyd know why the freertos core stops?

Br, Mircea

Re: rtos on A core does not remain active after linux boot

AldoG — Tue, 16 Jan 2024 19:02:48 GMT

Hello,

I have yet to try it on my side, but I believe that the Freertos core stops because it has no active task, this is just a guessing.

Have you tried any other example aside from the hello_world?
https://github.com/nxp-real-time-edge-sw/heterogeneous-multicore/tree/main/apps

Best regards/Saludos,
Aldo.

Re: rtos on A core does not remain active after linux boot

Ahelion — Wed, 17 Jan 2024 14:36:13 GMT

if it let it run, and do not start the Linux, the rtos keeps on going. Once the Linux starts, the UART output stops.

Re: rtos on A core does not remain active after linux boot

AldoG — Wed, 17 Jan 2024 20:19:39 GMT

Hello,

Could you please try using the following command at uboot:
=> setenv mmcargs "${mmcargs} clk_ignore_unused"
=> saveenv

Then start the hello_world example.

Best regards/Saludos,
Aldo.

Re: rtos on A core does not remain active after linux boot

Ahelion — Thu, 18 Jan 2024 08:04:44 GMT

thank you, I will try it in 1 week, I do not have time at the moment