On Wed, Oct 10, 2012 at 3:57 AM, 杨苏立 Yang Su Li <yangsuli@xxxxxxxxx> wrote: > On Tue, Oct 9, 2012 at 1:22 AM, Jassi Brar <jassisinghbrar@xxxxxxxxx> wrote: >> On Tue, Oct 9, 2012 at 2:06 AM, 杨苏立 Yang Su Li <yangsuli@xxxxxxxxx> wrote: >>> Hi, >>> >>> I have noticed this mailing list has been intensively used to discuss >>> patch development discussion. So please let me know if I should move >>> my question to more appropriate places. >>> >>> In order to experiment something I need to pretend that my phone has a >>> super fast SD card (faster than what is available in the market). So I >>> want to simulate it through desktop ramdisk (which is basically disk >>> in memory). And here is basically my plan: >>> >>> 1. Get an USB-OTG enabled phone (say Samsung galaxy nexus) >>> >>> 2. Connect this phone to a desktop via USB. >>> >>> 3. Naturally this phone will have some kind of USB driver running. >>> >>> 4. In the desktop I run the File-backed Storage Gadget (FSG), which >>> make an USB host to be an USB slave, and presents a block device >>> interface to the host which is backed by a ramdisk. >>> >>> 5. In the phone, mount the FSG mass storage just as an ordinary disk. >>> >> Don't you need to initialize the ramdisk with contents from phone's >> storage ? Otherwise it all boils down as unidirectional transfer of >> files from desktop to phone. For which you don't really need the OTG >> feature. >> If your ramdisk does need to reflect the phone's storage, you'll pay >> during the gadget connect (mount) and disconnect (unmount) times. > > I guess there might be some misunderstanding here. The ramdisk does > not need to "reflect" > the phone's storage. The ramdisk IS the phone's storage. Which means > the phone will mount this ramdisk as one of its data partition, and > read/write on that partition at runtime. > Yes I misunderstood. Somehow I got the impression that you want to make the desktop see the phone as a super fast storage. Now it all makes sense to me. Cheers. -- 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
