topic Re: imx8qxp m4 hangs at linux boot in i.MX Processors

imx8qxp m4 hangs at linux boot

angelo_d — Sun, 07 Feb 2021 09:06:34 GMT

Hi,

once loaded a cortex M4 image at u-boot (bootaux) and checked it works by interacting on the M4 console, i boot linux (boot cmd) and suddenly M4 stops to work. Is this normal ? Is there a way to keep M4 running over Linux boot ?

Re: imx8qxp m4 hangs at linux boot

igorpadykov — Sun, 07 Feb 2021 23:07:39 GMT

Hi spectrum

what bsp used in the case, one can try with latest Linux 5.4.70_2.3.0, use below dts

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm64/boot/dts/freescale/imx8qxp-mek-dsi-rm67191-rpmsg.dts?h=imx_5.4.70_2.3.0

linux documentation

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX?tab=In-Depth_Tab

Best regards
igor

Re: imx8qxp m4 hangs at linux boot

angelo_d — Mon, 08 Feb 2021 09:30:53 GMT

Hi Igor,

thanks for the feedback, but issue is still the same: at the moment when linux boots, M4 application stops to run.
I tested a mainline kernel, and it does not stops M4 at boot.

I am using

imx_5.4.70_2.3.0
imx8qxp-mek-dsi-rm67191.dtb

On M4, i am keeping running power_mode_switch app, that allows to use an interactive menu on M4 console, and i can see if M4 is running.

From u-boot, i do :

fatload mmc 1:1 ${loadaddr} power_mode_switch.bin && dcache flush && bootaux ${loadaddr} 0

(M4 demo works just after fw loading)

command line: console=ttyLP0,115200 root=/dev/mmcblk1p2 rootwait rw

As defconfig using one based on imx_v8_defconfig.

If any help, welcome.

Angelo

Re: imx8qxp m4 hangs at linux boot

igorpadykov — Tue, 09 Feb 2021 04:07:17 GMT

Hi Angelo

could you try imx8qxp-mek-dsi-rm67191-rpmsg.dts as was suggested.

Best regards
igor

Re: imx8qxp m4 hangs at linux boot

angelo_d — Tue, 09 Feb 2021 08:24:52 GMT

Hi Igor,

sorry, should have been a typo, i tested with fdt_file=imx8qxp-mek-dsi-rm67191-rpmsg.dtb

Same issue, M4 app stops to work as soon as the kernel boots, as some clocks or power is cut.

Re: imx8qxp m4 hangs at linux boot

angelo_d — Tue, 09 Feb 2021 08:51:36 GMT

Hi Igor,

re-adding here, tested i tested imx_5.4.70_2.3.0 with fdt_file=imx8qxp-mek-dsi-rm67191-rpmsg.dtb , still M4 stops to run at kernel boot.

i tested now imx_4.19.35_1.1.0, it does not stop M4 at boot.

So issue is related to imx_5.4.70_2.3.0. Please let me know if this is an open issue on imx_5.4.70_2.3.0.

Re: imx8qxp m4 hangs at linux boot

angelo_d — Tue, 09 Feb 2021 22:27:30 GMT

Hi,

seems something related my image built on dunfell and meta-freescale was causing the issue.
Probably something related to SCU fw.

Building using meta-nxp stuff (zeus, using 5.4.70_2.3.0)

MACHINE=imx8qxpmek source imx-setup-release.sh -b initial_build_dir

All seems to work.

Thanks

regards