sumit6975 Posted June 21, 2018 Share Posted June 21, 2018 I want to load my custom service to show orangepi zero as three devices on the host PC. But as the UDC ( /sys/class/udc/musb-hdrc.1.auto) is being used by another service which is probably the builtin service using udc to show orangepi as: Bus 001 Device 048: ID 0525:a4a7 Netchip Technology, Inc. Linux-USB Serial Gadget (CDC ACM mode) I want to disable that service so that my custom service can use the UDC for the required purpose. This is the command: echo "$(ls /sys/class/udc/)" > UDC and this is the error: echo: write error: Device or resource busy "ls /sys/class/udc" has the file musb-hdrc.1.auto and UDC is in the folder /sys/kernel/config/usb-gadget/< custom name>/ , which is created using a bash script Regards, Sumit Link to comment Share on other sites More sharing options...
sumit6975 Posted June 22, 2018 Author Share Posted June 22, 2018 Solved the problem (edited) Disabled usb gadget service of orangepi zero `sudo /sbin/rmmod g_serial` (edited) then `sudo bash create-gadget.sh` link to solution: https://vjordan.info/log/fpga/nanopi-neo-usb-otg-with-armbian-mainline-4x-kernel.html after `rmmod g_serial` , it can be verified on the host pc by `lsmod`. On the orangepi: `ls /dev/hid*` lists the hid device ports (hidraw1, hadraw2 ... ) and gadget port (hidg0) 1 Link to comment Share on other sites More sharing options...
Gravelrash Posted September 3, 2018 Share Posted September 3, 2018 just curious : what are you doing this for? Link to comment Share on other sites More sharing options...
ag123 Posted September 4, 2018 Share Posted September 4, 2018 may be useful, usb doesn't need to be simply serial, but that's defacto it can work as usb-audio, usb-storage, usb-video, usb-ethernet, usb-hid (keyboard, mouse, joystick, sensors etc), usb-serial, usb-dfu (device firmware upgrade), usb-mtp, etc etc http://www.usb.org/developers/docs/devclass_docs/ but one would need to write the 'driver' on the board talking to the host for it Link to comment Share on other sites More sharing options...
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