MSD not working

[stewartwatson321]

Hi

I am hoping you can help me. I cannot get MSD working - I have the error:

root@orangepizero2:~# systemctl status kvmd-otg
× kvmd-otg.service - PiKVM - OTG setup
     Loaded: loaded (/lib/systemd/system/kvmd-otg.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Sat 2023-04-22 10:48:54 UTC; 1min 53s ago
    Process: 697 ExecStart=/usr/bin/kvmd-otg start (code=exited, status=1/FAILURE)
   Main PID: 697 (code=exited, status=1/FAILURE)
        CPU: 1.777s

Apr 22 10:48:54 orangepizero2 kvmd-otg[697]:     _chown(join(func_path, "lun.0/forced_eject"), user)
Apr 22 10:48:54 orangepizero2 kvmd-otg[697]:   File "/usr/local/lib/python3.10/dist-packages/kvmd/apps/otg/__init__.py", line 55, in _chown
Apr 22 10:48:54 orangepizero2 kvmd-otg[697]:     shutil.chown(path, user)
Apr 22 10:48:54 orangepizero2 kvmd-otg[697]:   File "/usr/lib/python3.10/shutil.py", line 1375, in chown
Apr 22 10:48:54 orangepizero2 kvmd-otg[697]:     os.chown(path, _user, _group)
Apr 22 10:48:54 orangepizero2 kvmd-otg[697]: FileNotFoundError: [Errno 2] No such file or directory: '/sys/kernel/config/usb_gadget/kvmd/functions/mass_storage.usb0/lun.0/forced_eject'
Apr 22 10:48:54 orangepizero2 systemd[1]: kvmd-otg.service: Main process exited, code=exited, status=1/FAILURE
Apr 22 10:48:54 orangepizero2 systemd[1]: kvmd-otg.service: Failed with result 'exit-code'.
Apr 22 10:48:54 orangepizero2 systemd[1]: Failed to start PiKVM - OTG setup.
Apr 22 10:48:54 orangepizero2 systemd[1]: kvmd-otg.service: Consumed 1.777s CPU time.

I can bypass this by commenting line 188 in /usr/local/lib/python3.10/dist-packages/kvmd/apps/otg/init.py

_if user != "root":
            _chown(join(func_path, "lun.0/cdrom"), user)
            _chown(join(func_path, "lun.0/ro"), user)
            _chown(join(func_path, "lun.0/file"), user)
#added comment here#            _chown(join(func_path, "lun.0/forced_eject"), user)_

but this causes other problems.

Any ideas/suggestions?

Thanks!

[0x676e67]

I don't have a solution at the moment

[stewartwatson321]

Hi, in case it helps anyone, the problem is that forced_eject is not present in kernel version < 6.2.x.
It can be applied to lower version kernel with this kernel patch:

https://github.com/pikvm/packages/blob/master/packages/linux-rpi-pikvm/2002-usb-gadget-f_mass_storage-forced-eject.patch

[0x676e67]

Hi, in case it helps anyone, the problem is that forced_eject is not present in kernel version < 6.2.x.嗨，如果它对任何人有帮助，问题是内核版本 < 6.2.x 中不存在forced_eject。 It can be applied to lower version kernel with this kernel patch:可以使用此内核补丁将其应用于较低版本的内核：

https://github.com/pikvm/packages/blob/master/packages/linux-rpi-pikvm/2002-usb-gadget-f_mass_storage-forced-eject.patch

The BSP kernel hits this pudding, and the OTG analog HID fails