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  1. If your u-boot version is v2020.04, the log message will be somewhat different.

u-boot$ load mmc 1:1 0x48000000 rpmsg_lite_str_echo_rtos_imxcm4.bin

16828 bytes read in 16 ms (1 MiB/s)
u-boot$ run cpm4mem
u-boot$ run m4boot
Booting M4 from TCM
## Starting auxiliary core stack = 0x20020000, pc = 0x1FFE0355...

  2. If your u-boot version is v2020.04, the imx-atf patch should not be applied. This UART4 should be assigned to M4 domain in RDC.

Setup SD Card


Assuming that you have a working Yocto/Debian/Ubuntu SD card.