hello juergen.falb,
yes, you can enable Test Pattern Generator (TPG) buffer.
here’s example for enable TPG buffer for Xavier.
ubuntu@ubuntu-desktop:~$ sudo insmod /lib/modules/4.9.140-tegra/kernel/drivers/media/platform/tegra/tpg/nvhost-vi-tpg-t19x.ko
[sudo] password for ubuntu:
ubuntu@ubuntu-desktop:~$ ls /dev/video*
/dev/video0 /dev/video13 /dev/video18 /dev/video22 /dev/video27 /dev/video31 /dev/video36 /dev/video8
/dev/video1 /dev/video14 /dev/video19 /dev/video23 /dev/video28 /dev/video32 /dev/video4 /dev/video9
/dev/video10 /dev/video15 /dev/video2 /dev/video24 /dev/video29 /dev/video33 /dev/video5
/dev/video11 /dev/video16 /dev/video20 /dev/video25 /dev/video3 /dev/video34 /dev/video6
/dev/video12 /dev/video17 /dev/video21 /dev/video26 /dev/video30 /dev/video35 /dev/video7
for Jetson-TX2 you should insert kernel module nvhost-vi-tpg.ko.
you should be able to access /dev/video* with v4l2-ctl or nvarguscamerasrc
for example,
gst-launch-1.0 nvarguscamerasrc sensor-id=1 ! 'video/x-raw(memory:NVMM),width=1920, height=1080, framerate=30/1, format=NV12' ! nvoverlaysink -ev