CM4 USB power

[rpisnd]

I am experimenting with Circle on a CM4 / CM4 IO Board (fairly new to CM4).
Somehow I cannot get the USB ports powered upon boot.
The config.txt I am using is

armstub=armstub7-rpi4.bin
max_framebuffers=2

dtoverlay=dwc2,dr_mode=host
otg_mode=1

Thank you for any tips / recommendations.
t*no

[rsta2]

For USB operation on the CM4 you have to define the system option USE_XHCI_INTERNAL before build. Just add the following line to your Config.mk file:

DEFINE += -DUSE_XHCI_INTERNAL

This enables the support for the internal xHCI USB host controller of the CM4. The DWC2 OTG USB controller is not supported by Circle for the CM4.

In config.txt you need the following settings for USB in AArch64 mode:

arm_64bit=1
kernel=kernel8-rpi4.img
armstub=armstub7-rpi4.bin
otg_mode=1

Be sure to have the device tree blobs bcm2711-rpi-4-b.dtb and bcm2711-rpi-cm4.dtb on the SD card.

Finally the following setting in the file cmdline.txt helps, if some USB device is not detected:

usbpowerdelay=2000

[rpisnd]

Thank you very much - works perfectly!