Setting these in configfs was definitely a way to go, as I no longer get the 'oops' with the same setup, thank you. It is not yet discovered as WinUSB device, but this may be something on my side. Best regards, Wojtek On Fri, Mar 13, 2015 at 12:30 PM, Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx> wrote: > W dniu 13.03.2015 o 12:25, Andrzej Pietrasiewicz pisze: > >> Hi Wojciech, >> >> W dniu 13.03.2015 o 12:05, Wojciech Zając pisze: >>> >>> Hello, >>> >>> I was trying to create FunctionFS based, WinUSB gadget driver on EBV >>> SoCrates board (Altera Cyclone V SoC, dwc2 UDC), running 4.0-rc3 >>> Kernel, but this attempt ultimately failed with 'Oops'. >>> >> >> <snip> >> >>> >>> I wrote my own application for FunctionFS handling, starting with the >>> same set of descriptors (with minor changes to EP types, etc.). >>> This also worked as expected, but adding MS OS descriptors (using >>> functionfs.h structures) afterwards, did not. >>> Descriptors are accepted on ep0 write, but binding UDC causes the >>> following: >>> >>> [ 563.185116] ffs_do_os_descs() >>> [ 563.185122] ffs_do_single_os_desc() >>> [ 563.185137] Unable to handle kernel paging request at virtual >>> address 00ffff02 >> >> >> It might be a bug. That said, please see below. >> >> <snip> >> >>> I am not sure if this approach is a correct way of using OS >>> descriptors (what about MS string descriptor?) with FunctionFS >> >> >> You should set the contents of MS OS string descriptor and enable it. >> Here is what you can find in >> Documentation/ABI/testing/configfs-usb-gadget: >> >> What: /config/usb-gadget/gadget/os_desc >> Date: May 2014 >> KernelVersion: 3.16 >> Description: >> This group contains "OS String" extension handling >> attributes. >> >> use - flag turning "OS Desctiptors" support >> on/off >> b_vendor_code - one-byte value used for custom >> per-device and >> per-interface requests >> qw_sign - an identifier to be reported as "OS >> String" >> proper >> >> > > You should also link your gadget configuration to be used with OS > descriptors > into the os_desc directory, something on the lines of: > > # ln -s configs/c.1 os_desc > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
