need support to configure Dragonboard (qualcom 410E) as a USB mass storage device to be accessed from the connected linux host through OTG

Hello,
I am new to linux forum. I want to configure the dragon board (having qualcom 410 E processor) as a mass storage device so the file system (some files in the file system) could be accessed from the linux or windows host connected through the USB OTG. OS is debian 4.4.23

I have taken the following steps to enable the feature.
1. Enabled following in kernel config.

• i. USB gadget support
  ii. USB gadget drivers.
  iii. USB functions configurable through Configfs.
  iv. Mass storage
  v. Mass storage gadget.
  vi. Ethernet gadget is disabled.

2. build kernel and modules and flashed the kernel image through fastboot process as mentioned in the link https://builds.96boards.org/releases.../debian/16.09/ .
3. following commands i executed on the dragonboard.

• i. sudo modprobe configfs
  ii. sudo modprobe linkcomposite
  iii. sudo modprobe usb_f_mass_storage
  iv. sudo modprobe g_mass_storage file=/home/linaro/Documents/files

4. connected my drogon board to the linux host but no file system is detected.
i got the following logs on dragonboard in /var/log/messages when i connected the dragon board to host PC through OTG. There were no logs generated on host PC.

Feb 28 12:40:03 linaro-alip kernel: [25789.448501] msm_hsusb_host 78d9000.ehci: remove, state 1
Feb 28 12:40:03 linaro-alip kernel: [25789.448613] usb usb1: USB disconnect, device number 1
Feb 28 12:40:03 linaro-alip kernel: [25789.448732] usb 1-1: USB disconnect, device number 2
Feb 28 12:40:03 linaro-alip kernel: [25789.448756] usb 1-1.1: USB disconnect, device number 3
Feb 28 12:40:03 linaro-alip kernel: [25789.448779] usb 1-1.1.3: USB disconnect, device number 6
Feb 28 12:40:03 linaro-alip kernel: [25789.506447] usb 1-1.1.4: USB disconnect, device number 5
Feb 28 12:40:03 linaro-alip kernel: [25789.687549] usb 1-1.2: USB disconnect, device number 4
Feb 28 12:40:03 linaro-alip kernel: [25789.709375] msm_hsusb_host 78d9000.ehci: USB bus 1 deregistered
Feb 28 12:40:04 linaro-alip kernel: [25789.847889] msm_otg 78d9000.phy: Avail curr from USB = 100

Following is the output of lsmod.
linaro@linaro-alip:~$ lsmod
Module Size Used by
g_mass_storage 6022 0
usb_f_mass_storage 50812 2 g_mass_storage
libcomposite 54980 2 usb_f_mass_storage,g_mass_storage
configfs 33353 3 libcomposite,usb_f_mass_storage
bnep 18397 2
wcn36xx 70557 0
joydev 11855 0

Please share what wrong i have done. Please share if any more logs required.

Your question interests me, because I like to learn some more about embedded linux systems.

I looked up https://developer.qualcomm.com/hardw...agonboard-410c, which I think is your board.
It mentions that it has 2x USB 2.0 which only operate in host mode and 1x micro-USB which only operates in device mode.
Furthermore it mentions that they USB2.0 and micro-USB are mutually exclusive.
Do you use them at the same time?
Did you expand your board to have multiple USB connections?

If you connect your dragonboard to a host device you should see some action on the host device.
I reckon your linux host device runs udev.
You could run udevadm monitor to see what happens when you plug or unplug your USB dragonboard.
Furthermore, lsusb might help you to see which USB device you have connected on your host system.

I am interested to hear your response.

Thanks Hoes, for your response. I will share the results ASAP.