FM / hw_random

/sys/devices/virtual/misc/hw_random

Name	Size	Mode	Actions
power/	-	0755	rm
subsystem/	-	0755	rm
dev	4096	0444	edit dl rm
rng_available	4096	0444	edit dl rm
rng_current	4096	0644	edit dl rm
rng_selected	4096	0444	edit dl rm
uevent	4096	0644	edit dl rm

Edit: /sys/devices/virtual/misc/hw_random/rng_selected (4096B)

cmd: