Hello so I have 17.01.2 on my C20i but I dont seem to be able to get the USB port running I am not sure if this is due to the OS revision or if I have the wrong packages installed so my question is if some one of you uses the USB port and which packages you installed also which OS revision you have installed since I saw some changes in the git regarding USB support.
Well thanks in advance 
So I followed https://lede-project.org/docs/user-guide/usb-troubleshooting and installed all the needed drivers now it shows up according to https://github.com/lede-project/source/commit/9195d8da355d0d141ac02c9a5269452dc64ffd2d#diff-c340ba174c09c85918798e1f75e6bd18 and https://github.com/lede-project/source/commit/0ac2ef13f7a095eb0e397676fae642f59dad59e4#diff-c340ba174c09c85918798e1f75e6bd18 it has ohci and ehci so I used the kmod-usb2 dmesg shows the sda attached storage so it seems to work now I have to figure out how to exfat that
seems like f2fs is better for an usb drive https://lede-project.org/docs/user-guide/filesystems-and-partitions#ledelinux_filesystems
so according to https://lede-project.org/docs/user-guide/usb-drives#install_file_system_drivers_and_create_a_file_system_in_the_partition create partition and fs and setup the automatic mount https://lede-project.org/docs/user-guide/usb-drives#automount_the_partition