Hi
I am interested in getting usbtty support running on an AT91SAM9G20 board. I have picked up the latest code on the CDC head on the u-boot-usb GIT tree and am currently attempting to get the CDC-Ether support up and running (merging various changes from the 9261 board to the 9260).
However in order to support our factory processes (which are currently set up to use serial ports) we need to use the usbtty framework. I have had a quick go at replacing CONFIG_USG_ETHER with CONFIG_USB_TTY in the config file but it doesn't work. Digging around a bit I think this is due to the following points:
1. usbtty.c uses a global function call based UDC framework (udc_init, udc_endpoint_read|write etc) 2. This framework is implemented on the older UDC devices (omap1510_udc.c, pxa27x_udh.c & mpc8xx_udc.c) but is not implemented on at91_udc.c. 3. drivers/usb/gadget/ether.c uses a new (Linux derived?) USB gadget framework based on registering function tables and accessing via helper functions in gadget.h. 4. at91_udc.c is implemented to this framework.
Hence omap1510, pxa27x & mpc8xx support USB TTY operation and at91 supports ethernet operation but other combinations are not currently possible.
Please could someone advise on the best way forward, initially I can think of a couple of options as follows:
1. create a wrapper that implements the old framework functions (udc_init, udc_endpoint_read|write etc) and simply maps them on to the new framework. 2. import the appropriate TTY gadget implementation from Linux (as for ether.c) and get it working and registered as a proper device.
I suspect 2 is the better option and the way that the project was moving, but I thought I'd check if this was the way to go and whether anyone else had made any progress in this area. Also, if this is the way to go, could someone confirm which version of the Linux Gadget framework ether.c and friends are based on. It appears to be completely different to the latest version.
Cheers
Daniel Sherwood Software Engineer
Sepura PLC
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