Christian Adams wrote: > moinmoin > > there is no "must" for using /dev/mmc* .. you could also use a plain > file: > > preparations: > > create mem_stick.fs file > dd if=/dev/zero of=mem_stick.fs bs=512 count=1048576 # for a 512mb > "memory-stick" with blocksize=512 bytes > > create filesystem on mem_stick.fs: > mkfs.ext3 mem_stick.fs > > from FR you can mount this filesystem with: > mount -o loop mem_stick.fs some_mount_point > > and for exporting via usb: > > rmmod g_ether > # if mount -> umount! > modprobe g_file_storage file=mem_stick.fs > > regards, morlac > > >> On Fri, Sep 5, 2008 at 4:41 AM, Dale Maggee >> <[EMAIL PROTECTED]> wrote: >> >>> Petr Vanek wrote: >>> >>>> I have spent a while googling this up and have no wiki skills but >>>> someone might find this useful: >>>> >>>> to make FR act as a memory stick, here is what my script does: >>>> >>>> >>>> #!/bin/sh >>>> /etc/init.d/networking stop >>>> rmmod g_ether >>>> modprobe g_file_storage file=/dev/mmcblk0p1 >>>> >>>> -- >>>> Petr Vaněk >>>> http://biodynamika.cz >>>> >>>> >>> very cool, but before I test it out (potentially breaking my usb >>> networking in the process), I have a couple of questions: >>> >>> 1. will this persist over a reboot, or will it revert back to >>> being an >>> ethernet gadget when I reboot? >>> >> It's not persistent unless you add something like this to the init >> scripts. After rebooting the ethernet gadget will be back. >> >> >>> 2. is the following sufficient to switch it back? >>> >>> #!/bin/sh >>> rmmod g_file_storage >>> modprobe g_ether >>> ifup usb0 >>> >>> (assuming I replaced '/etc/init.d/networking stop' with 'ifdown >>> usb0' as >>> recommended by Daniel) >>> >>> 3. can somebody point me to a resource for the g_file_storage module >>> where I can learn more about it? I did a couple of quick googles but >>> didn't see anything promising. specifically I'd like to know more >>> about >>> the file parameter - I assume that in this scenario our "usb >>> stick" is >>> using partition/device information from /dev/mmcblk0p1, and will be >>> partitioned in the same way as the SD card? what If I wanted to >>> have my >>> home directory accessible in "usb stick" mode? >>> >> I suggest to read the comment in the source code, it's quite detailed: >> http://git.kernel.org/?p=linux/kernel/git/torvalds/ >> linux-2.6.git;a=blob;f=drivers/usb/gadget/file_storage.c;hb=HEAD >> >> The file parameter determines the raw backing store for the storage >> device, so if you >> have file=/dev/mmcblk0p1, its contents will directly appear as >> /dev/sdx on the host. As mmcblk0p1 doesn't contain a partition table, >> so won't sdx. If you want to export the whole device, use >> file=/dev/mmcblk0, you'll get the partition table in /dev/sdx and the >> kernel will parse it and create /dev/sdx1 (containing the contents of >> /dev/mmcblk0p1) etc. >> >> The host has direct access to the block device, so it is important >> that /dev/mmcblk0p1 is not mounted on both the phone and the host at >> the same time (unless it's mounted ro on both). >> >> regards >> Philipp >> >> > >
Thanks for the info! very usefull indeed! I made a script as follows (echo's are for debugging): #!/bin/sh echo ifdown usb0... ifdown usb0 echo rmmod g_ether... rmmod g_ether echo umount /media/card... umount /media/card echo modprobe g_file_storage file=/dev/mmcblk0p1... modprobe g_file_storage file=/dev/mmcblk0p1 only problem is, when i run this in the 2007.2 terminal, it echoes 'umount /media/card', and then totally freezes the freerunner! (to the point ofhaving to unplug the battery and reboot) if i comment out the offending line in the script, then type 'umount /media/card', then run the script, it works fine... thoughts? Thanks, -Dale _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
