nidhi mittal hada <nidhimittal19@...> writes: > Step 1 : > I acquire some data on beagle board on angstrom linux and send to SD > Card by mounting it on Beagle Board. > Now I unmount the card from beagle board andÂuse g_file_storage gadget > driver to mount the sd card on host. > > Step2 : Now after Host acquires the data from the sd card, Then i want > to remove driver & mount it on Beagleboard and use storage again on > B.Board. > > But How will the beagle board know > when to again unmount the gadget driver and again mount sd card on beagle board. > > How does BB capture the eject event ? The f_mass_storage.c (ie. Mass Storage Function) lets you register a callback when eject request is issued. You can make host notify the device that it's finished by ejecting the media and handling it accordingly in your gadget. > Is there some concept of composite driver in linux > where mass storage class can be used along side say uart interface > ...........using the same physical usb communication path to send > commands from host to beagle board which can aid the above operation. g_multi can do that. It also has support for Ethernet. You might, however, get away with just the Mass Storage Function. You might find this article helpful: <http://lwn.net/Articles/395712/>. Parts of it may be outdated though. You might also give <Documentation/usb/gadget_multi.txt> and <Documentation/usb/ gadget_serial.txt> a look. -- 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
