i.MX8M Mini EVK & RPMsg on Zephyr

[nussjo]

Hello all,

recently I wanted to get started developing on an i.MX8M Mini EVK with an RPMsg-based sample as a starting point. This board features an A53, which will be running a custom Yocto image, and a M4 co-processor running Zephyr. The reference manual of the board states that for communication between those two processors the Messaging Unit (MU) module is present.

Comparing with the existing sample in samples/driver/ipm/ipm_imx, I came up with the following overlay (since there was none available for the imx8mm_evk yet):

/ {
	soc {
		mub: mu@30ab0000 {
			compatible = "nxp,imx-mu";
			reg = <0x30ab0000 0x4000>;
			interrupts = <97 0>;
			rdc = <0xf>;
			label = "MU_B";
			status = "okay";
		};
	};
};

and prj.conf:

CONFIG_STDOUT_CONSOLE=n
CONFIG_PRINTK=y
CONFIG_IPM=y
CONFIG_IPM_IMX=y
CONFIG_IPM_IMX_MAX_DATA_SIZE_4=y

Interestingly enough, soc/arm/nxp_imx/mimx8mm6_m4/kconfig.soc describes it as mcux, i.e.

config SOC_MIMX8MM6
	bool "SOC_MIMX8MM6"
	select HAS_MCUX
	select HAS_MCUX_CCM
	select HAS_MCUX_RDC

However, the sample in samples/driver/ipm/ipm_mcux uses a 'nxp,lpc-mailbox', which is not available according to the reference manual of the i.MX8.

What am I missing to make such a IPC sample work for this board?

Thanks in advance for helping an absolute newcomer to Zephyr!

[nussjo]

looks like the issue is resolved by #42320 - this also clears the confusion between the CONFIG_IPM_IMX and CONFIG_IPM_MCUX usage