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I made a custom os for the raspberry pi CM4 with IO board using buildroot. make raspberrypicm4io_64_defconfig make menuconfig make all

Buildroot OS boots with no errors.

However, when i flash the OS image to the CM4 the USB ports do not work, on the IO board.

I edited the boot partition and added dtoverlay=dwc2,dr_mode=host and removed all unnecessary cables connected to the IO board like the micro-USB cable, but the USB ports still don't work. I can confirm the the USB ports work, because i tested them with the official rasbian os.

Echo
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  • "*I can confirm the the USB ports work, because i tested them with the official rasbian os.*" -- Then you have a baseline for comparison with what you built. Compare the kernel boot logs. Compare the Device Trees; if you can't find the source file(s), then use **/proc/device-tree/** of the running system. – sawdust Jul 04 '23 at 03:07

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