On 11/12/2018 14:00, Mathias Nyman wrote: >> Any advice or experience as to what we might be missing? > > What does sudo lsusb -v on the host say about the target device? > What's the dbc status on the target? you did enable it right? > (on target, cat /sys/bus/pci/devices/0000:00:14.0/dbc) Is this documentation incomplete? https://www.kernel.org/doc/html/v4.14/driver-api/usb/usb3-debug-port.html There's no mention of needing to manipulate the 'dbc' node on either the host or the target. In fact, it wouldn't make sense to manipulate it on the target since we're trying to capture the kernel earlyprintk using "earlyprintk=xdbc" and the target doesn't necessarily reach userspace.
