Debug port and cortex-A apps

[ravi_kohli]

Hi,

I have SCU (CM4) debug port output from the UART and 2xCM4 UART serial access as well for the i.MX8QM EVK. Is there any serial output accessible from the AP cores (4xA53 and 2xA72) ? In other words, I don't see UART access for the AP cores. Is there some way for checking the start of any of the AP cores (A53 or A72) from the debug port or the SCU FW ?

Thanks in advance.

[igorpadykov]

Hi ravi.kohli

it is possible to create image with enabled Cortex-A and Cortex-M4 in

various combinations as described on

i.MX8 Boot process and creating a bootable image 

For uart one can check:

imx8qm_mek.h\configs\include - uboot-imx - i.MX U-Boot 

imx8qm_mek.c\imx8qm_mek\freescale\board - uboot-imx - i.MX U-Boot 

cpu.c\imx8\mach-imx\arm\arch - uboot-imx - i.MX U-Boot 

example of starting m4 from linux

m4ctrl - M4 Control Tool for i.MX platforms 

Best regards
igor
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[ravi_kohli]

Thanks Igor.