dwc2

[vanti]

Hi, I have built umtprd on beaglebone black running their default Debian image (Debian 9.5 2018-08-30 4GB SD IoT), and put it under /usr/bin. I have gadgetfs, but got an error when running umtprd.sh:
modprobe: FATAL: Module dwc2 not found in directory /lib/modules/4.14.67-ti-r73

Looks like the script is trying to invoke modprobe on dwc2. What is the latter - is it necessary and what should I do to get it?

[jfdelnero]

No, dwc2 is not needed for the beaglebone.
This is a driver used with the raspberry pi.

[vanti]

Thanks. I removed that line, and now I am getting a different error from 'mount -t gadgetfs gadgetfs /dev/gadget':
mount: unknown filesystem type 'gadgetfs'

'modprobe gadgetfs' seems to work fine, and I got the following in dmesg:
[ 133.545277] gadgetfs: USB Gadget filesystem, version 24 Aug 2004

Any idea what else I need to do?

[jfdelnero]

This probably means that the usb device driver is not loaded. Check if you have an usb device driver ko module available. If not you may have to build it from the kernel sources.

[vanti]

It seems I have the usb driver loaded:

debian@beaglebone:~/uMTP/uMTP-Responder/conf$ lsmod
Module Size Used by
gadgetfs 24576 0
pruss_soc_bus 16384 0
evdev 24576 1
uio_pdrv_genirq 16384 0
uio 20480 1 uio_pdrv_genirq
8021q 32768 0
garp 16384 1 8021q
mrp 20480 1 8021q
stp 16384 1 garp
llc 16384 2 garp,stp
usb_f_mass_storage 53248 2
usb_f_acm 16384 2
u_serial 20480 3 usb_f_acm
usb_f_ecm 20480 2
usb_f_rndis 32768 4
u_ether 20480 2 usb_f_ecm,usb_f_rndis
libcomposite 65536 18 usb_f_ecm,usb_f_acm,usb_f_mass_storage,usb_f_rn dis
iptable_nat 16384 0
nf_conntrack_ipv4 20480 1
nf_defrag_ipv4 16384 1 nf_conntrack_ipv4
nf_nat_ipv4 16384 1 iptable_nat
nf_nat 32768 1 nf_nat_ipv4
nf_conntrack 143360 3 nf_conntrack_ipv4,nf_nat_ipv4,nf_nat
iptable_mangle 16384 0
iptable_filter 16384 0
spidev 20480 0
pru_rproc 28672 0
pruss 16384 1 pru_rproc
pruss_intc 16384 1 pru_rproc
ip_tables 24576 3 iptable_mangle,iptable_filter,iptable_nat
x_tables 36864 3 iptable_mangle,ip_tables,iptable_filter

Which image did you use for validation on beaglebone black? Mine is the default one (Debian 9.5 2018-08-30 4GB SD IoT) downloaded from their website: https://beagleboard.org/latest-images

[jfdelnero]

Ok i see : You have the libcomposite layer loaded conflicting with the gadgetfs layer.
gadgetfs can't be used with libcomposite loaded.

2 solutions :

• unload all libcomposite drivers and start gadgetfs.
  or
• try to use umtprd in FunctionFS/libcomposite mode. This mode still in development and is currently only available on the trunk repository.
  See the umtprd-ffs.sh and umtprd.conf for the ffs mode setting example.

[vanti]

Thanks. I decided to try the FunctionFS mode. I uncommented these lines in umtprd.conf:

usb_functionfs_mode 0x1

usb_dev_path   "/dev/umtp/ep0"
usb_epin_path  "/dev/umtp/ep1"
usb_epout_path "/dev/umtp/ep2"
usb_epint_path "/dev/umtp/ep3"

usb_max_packet_size 0x200

Then I ran the code in umtprd-ffs.sh. I had to change the executable permission on the files for 'echo' to work. Other then that, the script ran fine for the most part but it gives an error on the last line:

echo 300000.gadget > cfg/usb_gadget/g1/UDC
echo: write error: No such device

Any idea what went wrong? Also I noticed the line that is invoking 'umtprd' is commented out in the file. Was this intentional?

[UHU-ger]

I got it running on the BeagleBoneBlack (with disabling libcomposite)
(Using BeagleBoard.org Debian Image 2018-10-07: bone-debian-9.5-lxqt-armhf-2018-10-07-4gb.img)

• with FunctionFS I got the same Problems you stated

How i got rid of libcomposite:

in the file opt/scripts/boot/am335x_evm.sh
i added the # to the folling lines in use_libcomposite () { (possibly not the best way, but it worked)

#        echo "${log} modprobe libcomposite"
#        modprobe libcomposite || true
#        if [ -d /sys/module/libcomposite ] ; then
#                run_libcomposite
#        else
#                if [ -f /sbin/depmod ] ; then
#                        /sbin/depmod -a
#                fi
#                echo "${log} ERROR: [libcomposite didn't load]"
#        fi

after a restart lsmod shows libcomposite is gone

These are the commands i used to download and setup uMTP-Responder

cd ~
wget https://github.com/viveris/uMTP-Responder/archive/master.zip
unzip master.zip

cd uMTP-Responder-master
make
sudo cp umtprd /usr/bin/umtprd

cd conf/
sudo mkdir /etc/umtprd
sudo cp umtprd.conf /etc/umtprd/umtprd.conf
sudo nano /etc/umtprd/umtprd.conf

I added the # to the -- GadgetFS Mode : Raspberry PI Zero / Raspberry PI Zero W Boards -- options
and added

########################################################################
#
# -- GadgetFS Mode : BeagleBone Black --
#
########################################################################

usb_dev_path   "/dev/gadget/musb-hdrc"
usb_epin_path  "/dev/gadget/ep1in"
usb_epout_path "/dev/gadget/ep2out"
usb_epint_path "/dev/gadget/ep3in"

# Max USB packet size

usb_max_packet_size 0x200

at the end of the File
(you can instead change the usb_dev_path from the Pie enty to "/dev/gadget/musb-hdrc"

To start uMTP-Responder:

chmod +x ~/uMTP-Responder-master/conf/umtprd.sh
sudo ~/uMTP-Responder-master/conf/umtprd.sh

It may not be the best way to get it to work, but it works.
I hope it helps you (and others)
I would have been happy to find a Guide like this.

[jfdelnero]

Thanks for your feedback ! Anyway i recommend to use the standard FunctionFs mode since this is now supported by the uMTP-Responder.