Dingoo Linux News - USB ethernet is broken

Another Dingoo linux news update from Booboo:

As many of you have reported, the USB ethernet gadget device didnot work with Windows. This is due to a kernel bug which was fixed in 2.6.24.6 (thanks to mofive for pointing this out). I've backported the trivial fix and now the A320 is detected as network device and the drivers seem to work with Windows at a first glance.

However, something else is badly broken: if you start a file transfer (from the A320 to the PC to keep the flash write delay out of the measurement) you'll see a high sustained throutput for a few seconds (about 40Mbit/s), and then the link crashes. In linux the link recovers after a delay, in windows the crash is permanent until you unplug and plug again the USB cable.

(note: iperf is available in the rootfs, you can use it to test transfer without using FTP)

The bug may be in the ethernet gadget code itself or in the JZ4740 USB driver code. I've traced the evolution of the ethernet gadget code through all subsequent kernel versions and there seem to be some fixes I could use. I intend to first try to backport these fixes and see it this solves the problem. If it does not, I'll then look to the JZ4740 USB driver code.

I will be releasing a new rootfs/toolchain tomorrow which will include the mentioned USB ethernet gadget fix to work with windows (but remember, it is broken anyway) and a modified SDL library that no longer requires "export SDL_NOMOUSE=1".

http://www.dingux.com/2009/07/usb-et...is-broken.html