raspberrypi3:~# systemctl status weston.service
● weston.service - Weston Wayland Compositor
   Loaded: loaded (/lib/systemd/system/weston.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2019-07-01 21:20:13 UTC; 26s ago
  Process: 787 ExecStart=/usr/bin/weston --idle-time=0 --tty=1 --log=/run/platform/display/weston.log (code=exited, status=1/FAILURE)
  Process: 779 ExecStartPre=/usr/bin/chsmack -a User::App-Shared -t /run/platform/display/share (code=exited, status=0/SUCCESS)
  Process: 763 ExecStartPre=/bin/mkdir -p /run/platform/display/share (code=exited, status=0/SUCCESS)
 Main PID: 787 (code=exited, status=1/FAILURE)Jul 01 21:20:12 raspberrypi3 systemd[1]: Starting Weston Wayland Compositor...
Jul 01 21:20:13 raspberrypi3 systemd[1]: weston.service: Main process exited, code=exited, status=1/FAILURE
Jul 01 21:20:13 raspberrypi3 systemd[1]: weston.service: Failed with result 'exit-code'.
Jul 01 21:20:13 raspberrypi3 systemd[1]: Failed to start Weston Wayland Compositor.

raspberrypi3:~# cat /run/platform/display/weston.log
Date: 2019-07-01 UTC
[21:19:44.931] weston 6.0.0
               https://wayland.freedesktop.org
               Bug reports to: https://gitlab.freedesktop.org/wayland/weston/issues/
               Build: unknown (not built from git or tarball)
[21:19:44.932] Command line: /usr/bin/weston --idle-time=0 --tty=1 --log=/run/platform/display/weston.log
[21:19:44.932] OS: Linux, 4.14.98, #1 SMP Mon Jul 1 22:38:08 UTC 2019, armv7l
[21:19:44.932] warning: XDG_RUNTIME_DIR "/run/platform/display" is not configured
correctly.  Unix access mode must be 0700 (current mode is 770),
and must be owned by the user (current owner is UID 200).
Refer to your distribution on how to get it, or
http://www.freedesktop.org/wiki/Specifications/basedir-spec
on how to implement it.
[21:19:44.956] Using config file '/etc/xdg/weston/weston.ini'
[21:19:44.969] Output repaint window is 7 ms maximum.
[21:19:44.988] Loading module '/usr/lib/libweston-6/drm-backend.so'
[21:19:45.079] initializing drm backend
[21:19:45.079] logind: not running in a systemd session
[21:19:45.080] logind: cannot setup systemd-logind helper (-61), using legacy fallback
[21:19:45.080] no drm device found
[21:19:45.080] fatal: failed to create compositor backend
[21:19:45.080] Internal warning: debug scope 'drm-backend' has not been destroyed.
Date: 2019-07-01 UTC
[21:19:48.711] weston 6.0.0
               https://wayland.freedesktop.org
               Bug reports to: https://gitlab.freedesktop.org/wayland/weston/issues/
               Build: unknown (not built from git or tarball)
[21:19:48.711] Command line: /usr/bin/weston --idle-time=0 --tty=1 --log=/run/platform/display/weston.log
[21:19:48.725] OS: Linux, 4.14.98, #1 SMP Mon Jul 1 22:38:08 UTC 2019, armv7l
[21:19:48.726] warning: XDG_RUNTIME_DIR "/run/platform/display" is not configured
correctly.  Unix access mode must be 0700 (current mode is 770),
and must be owned by the user (current owner is UID 200).
Refer to your distribution on how to get it, or
http://www.freedesktop.org/wiki/Specifications/basedir-spec
on how to implement it.
[21:19:48.726] Using config file '/etc/xdg/weston/weston.ini'
[21:19:48.726] Output repaint window is 7 ms maximum.
[21:19:48.727] Loading module '/usr/lib/libweston-6/drm-backend.so'
[21:19:48.738] initializing drm backend
[21:19:48.738] logind: not running in a systemd session
[21:19:48.739] logind: cannot setup systemd-logind helper (-61), using legacy fallback
[21:19:48.739] no drm device found
[21:19:48.739] fatal: failed to create compositor backend
[21:19:48.740] Internal warning: debug scope 'drm-backend' has not been destroyed.