Raspberry Pi CM4 USB

For Developers
1

Hello,
I'm trying to get my CM4 up and working but I've some trouble with USB
I've build an image for the Raspberry Pi 4 family (seems to be the same firmware for all the versions)
It works well on a Raspberry Pi 4, at least USB2 and PCIe, my modem doesn't start when plugged in a USB3 port
Error message:

Enable of device-initiated U1 failed
Enable of device-initiated U2 failed

Not a big deal for now as I'd like to use it with USB2 and PCIe.
After these tests I decided to move on the CM4, with CM4IO carrier and nothing is detected on the USB ports, even a keyboard or a mouse are not detected.
The command lsusb doesn't report any device.

From the CM4 datasheet, the USB is disabled by default, to enable it you need to add a line in /boot/config.txt

dtoverlay=dwc2,dr_mode=host

After applying this and several reboot, power cycles, nothing new with the USB.
I'd like to make the CM4IO work before debugging my custom carrier.
Anyone has a clue to solve this issue?

2

Hi Vincent,
have you already found a solution for the problem with the USB interface at the CM4IO. I have exactly the same problem and made the same changes like you and no idea anymore what I can do now.

Update 08:53 am:
I think I found the solution. The kernel module "kmod-usb-dwc2" was not installed. After the installation
of this module

root@OpenWrt:~# opkg update
root@OpenWrt:~# opkg install kmod-usb-dwc2

the USB interface was working.

Don't forget the dtoverlay=dwc2,dr_mode=host entrie in the /boot/config.txt file.

Best regards
Martin

3

Hi Martin,
I've checked my image and in the process, somehow, dwc2 and dwc3 module has been remove from the build.
Now it's working with the config file modified.

Thanks for the tip

4

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.