Do a grep FD628 instead.
And systemctl status fd628
Edit:
You're supposed to copy the raw text from the vfd in the repository.
Code
LibreELEC:~ # dmesg | grep -i fd628
[ 28.845365@0] aml_fd628: `' invalid for parameter `vfd_gpio_clk'
LibreELEC:~ #
Code
● fd628.service - Amlogic FD628 Service
Loaded: loaded (/usr/lib/systemd/system/fd628.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Sat 2018-03-24 11:17:10 UTC; 29min ago
Process: 2685 ExecStart=/bin/sh -c [ `cat /proc/device-tree/le-vfd/compatible` = "le,vfd" ] && /sbin/modprobe aml_fd628 vfd_gpio_clk=${vfd_gpio_clk} vfd_gpio_dat=${vfd_gpio_dat} vfd_gpio_stb=${vfd_gpio_stb} vfd_chars=${vfd_chars} vfd_dot_bits=
${vfd_dot_bits} vfd_display_type=${vfd_display_type} (code=exited, status=1/FAILURE)
Main PID: 2685 (code=exited, status=1/FAILURE)
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Ignoring invalid environment assignment '<li><clipboard-copy class=dropdown-itemid="js-copy-permalink" style="cursor:pointer;" data-original-text="Copy permalink">Copy permalink</clipboard-cop
y></li>': /storage/.config/vfd.conf
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Ignoring invalid environment assignment '<li><a class=dropdown-itemid="js-new-issue" href="/arthur-liberman/vfd-configurations/issues/new">Open new issue</a></li>': /storage/.config/vfd.conf
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Ignoring invalid environment assignment '<input class=form-control linejump-input js-jump-to-line-fieldtype="text" placeholder="Jump to line…" aria-label="Jump to line" autofocus>': /st
orage/.config/vfd.conf
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Ignoring invalid environment assignment '<li><a data-ga-click=Footer, go to about, text:abouthref="https://github.com/about">About</a></li>': /storage/.config/vfd.conf
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Ignoring invalid environment assignment '<a aria-label=Homepagetitle="GitHub" class="footer-octicon" href="https://github.com">': /storage/.config/vfd.conf
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Ignoring invalid environment assignment '<script crossorigin=anonymousasync="async" type="application/javascript" src="https://assets-cdn.github.com/assets/github-6df5d6f70023b7d0db8303ef94848
89c.js"></script>': /storage/.config/vfd.conf
Mar 24 11:17:10 LibreELEC systemd[1]: Starting Amlogic FD628 Service...
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Main process exited, code=exited, status=1/FAILURE
Mar 24 11:17:10 LibreELEC systemd[1]: fd628.service: Failed with result 'exit-code'.
Mar 24 11:17:10 LibreELEC systemd[1]: Failed to start Amlogic FD628 Service.
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I copied the vfd.conf directly from your link and renamed it.
I do not know what you mean by 'raw text' ..... all I can say is I did not introduce any formatting into the file that I am aware of.
Hope the above can provide some indication of the problem.
Thanks.