UDC core dependent of CONFIG_MODULES?

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Hi all,

is the UDC core meant to be used only with CONFIG_MODULES=y? Because I have the problem, that I want to configure g_ether via CONFIGFS, but when I do

ls /sys/class/udc/ > /sys/kernel/config/usb_gadget/g/UDC

in order to enable the gadget, I get the error:

[ 314.569798] udc-core: couldn't find an available UDC or it's busy

Sure g_ether is already enabled via UDC and as such cannot be configured anymore:

[ 9.981767] udc 49000000.usb-otg: registering UDC driver [g_ether]

Trying to disable UDC via:

echo "" > /sys/kernel/config/usb_gadget/UDC

won't help either. Am I forced to use modules here? Or am I doing something wrong?


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