Missing USB serial drivers for DSM 7 
Import from Jadahl.com (Oct 2022)
Since the website Jadahl.com, another good source of DSM modules, has been offline for some time and doesn't look like it might be coming back, I retrieved all modules that were posted there (via https://web.archive.org) and added them to this repository. Thank you very much to the person that ran it 😊
Supported drivers
cp210xch341pl2303(not for all platforms)ti_usb_3410_5052(not for all platforms)
Supported platforms
Drivers for DSM 7.0 are available for most platforms, drivers for DSM 7.1 are slowly being added. If you're missing drivers for a particular platform, please open an issue and I see what I can do (please also add the kernel version of your platform to your issue, you can find that out with uname -a from a terminal).
Which platform does my Synology use?
Find your Synology model on this page and check the "Package Arch" column (second last).
Downloading a module
Github is a bit confusing if you want to download binary files like this repository provides.
For instance, if you go to this page, the links to the .ko files are not download links, they will just bring you to the information page for that particular file.
From there, you can download the actual binary module file using the "Download" button in the bottom square in the page.
Installation
NB: the following steps will require SSH access and administrator rights. For the latter, either use sudo for each command or use su to log in as root.
- The kernel modules for each supported platform can be found in
modules/. Copy the required files to your Synology and move them to/lib/modules - To get DSM 7 to load the modules at boot time, copy the included file
usb-serial-drivers.shto/usr/local/etc/rc.d - Make sure that the file has executable permissions:
chmod +x /usr/local/etc/rc.d/usb-serial-drivers.sh
You don't need to reboot your NAS for the modules to load, just execute the script after you completed the previous steps:
# /usr/local/etc/rc.d/usb-serial-drivers.sh start
Alternative method of loading modules at boot
This method is explained in this comment by @GravityRZ:
-
Create a file named
95-usb-serial.confin the directory/usr/lib/modules-load.d -
Set the correct permissions for the file:
sudo chmod 644 /usr/lib/modules-load.d/95-usb-serial.conf -
Edit the file and add the modules that need to be loaded at boot. All modules require that
usbserial.kois loaded too, so make sure to add that first.For example, to load the
ch341.komodule, add the following to the file:usbserial.ko ch341.ko
Building from source
I've built these modules in an Ubuntu 18.04.5 virtual machine on my Synology NAS.
To set up the build environment, I followed the steps in this document. The different NAS targets/platforms can be installed next to each other.
To build the modules for a particular platform, I follow these steps:
sudo rm -fr /toolkit/build_env/ds.$platform-7.0/source
sudo /toolkit/pkgscripts-ng/PkgCreate.py -X 0 -P 1 -v 7.0 --min-sdk 7.0 -p $platform $module
cp -v /toolkit/build_env/ds.$platform-7.0/source/$module/*.ko /tmp
Replace $platform with the NAS platform, for example apollolake.
Replace $module with the source directory name (found in sources/ in this repository) relevant for that particular platform. For example, apollolake requires the 4.4.x sources.
Put together, to build for apollolake, the commands become:
sudo rm -fr /toolkit/build_env/ds.apollolake-7.0/source
sudo /toolkit/pkgscripts-ng/PkgCreate.py -X 0 -P 1 -v 7.0 --min-sdk 7.0 -p apollolake 4.4.x
cp -v /toolkit/build_env/ds.apollolake-7.0/source/$module/*.ko /tmp
Due to some concurrency issues that I haven't bothered to look into, the second step (PkgCreate) sometimes fails with a compilation error. If that happens, start over.
The last step will copy the driver modules to /tmp
Disclaimer
I don't/can't test every driver. Use at your own peril.
Attribution
I'm using the source code (as-is) for the drivers included in the Linux kernel from the Synology Open Source Project and the Synology Toolchain GPL sources.