Hi,
I was wondering if the Watchdog timer on the Jetson Nano is exposed. I would normally expect to see it in /dev/watchdog
however in my case the file is not there. The strange thing is that I can see that there is a watchdog process running. Does this mean the watchdog is exposed but in a different location?
I have attached some debug below in case it is helpful.
- I am running L4T 32.3.1
- By running
ps aux
I can see that the watchdog daemon is running - But doing an
ls
in /dev does not reveal the watchdog.
Any help would be appreciated.
Regards,
$ head -n 1 /etc/nv_tegra_release
# R32 (release), REVISION: 3.1, GCID: 18186506, BOARD: t210ref, EABI: aarch64, DATE: Tue Dec 10 06:58:34 UTC 2019
$ ps aux | grep watchdog
root 12 0.0 0.0 0 0 ? S Jun22 0:00 [watchdog/0]
root 15 0.0 0.0 0 0 ? S Jun22 0:00 [watchdog/1]
root 21 0.0 0.0 0 0 ? S Jun22 0:00 [watchdog/2]
root 27 0.0 0.0 0 0 ? S Jun22 0:00 [watchdog/3]
root 717 0.0 0.0 0 0 ? S< Jun22 0:00 [watchdogd]
benky58un 22153 0.0 0.0 5672 616 pts/0 S+ 10:40 0:00 grep --color=auto watchdog
$ ls /dev/watch*
ls: cannot access '/dev/watch*': No such file or directory
$ ls /dev
autofs hugepages max_gpu_power net nvhost-vi ram0 stderr tty22 tty46 ttyp1 vcs1
block i2c-0 max_online_cpus network_latency nvhost-vic ram1 stdin tty23 tty47 ttyp2 vcs2
btrfs-control i2c-1 media0 network_throughput nvmap ram10 stdout tty24 tty48 ttyp3 vcs3
bus i2c-2 media1 null port ram11 tegra_camera_ctrl tty25 tty49 ttyp4 vcs4
char i2c-3 mem nvhdcp0 ppp ram12 tegra_cec tty26 tty5 ttyp5 vcs5
console i2c-4 memory_bandwidth nvhdcp1 psaux ram13 tegra-crypto tty27 tty50 ttyp6 vcs6
constraint_cpu_freq i2c-5 min_online_cpus nvhost-as-gpu ptmx ram14 tegra_dc_0 tty28 tty51 ttyp7 vcsa
constraint_gpu_freq i2c-6 mmcblk0 nvhost-ctrl pts ram15 tegra_dc_1 tty29 tty52 ttyp8 vcsa1
constraint_online_cpus iio:device0 mmcblk0p1 nvhost-ctrl-gpu ptyp0 ram2 tegra_dc_ctrl tty3 tty53 ttyp9 vcsa2
cpu_dma_latency initctl mmcblk0p10 nvhost-ctrl-isp ptyp1 ram3 tegra_mipi_cal tty30 tty54 ttypa vcsa3
cpu_freq_max input mmcblk0p11 nvhost-ctrl-isp.1 ptyp2 ram4 tty tty31 tty55 ttypb vcsa4
cpu_freq_min keychord mmcblk0p12 nvhost-ctrl-nvdec ptyp3 ram5 tty0 tty32 tty56 ttypc vcsa5
cuse kmem mmcblk0p13 nvhost-ctrl-vi ptyp4 ram6 tty1 tty33 tty57 ttypd vcsa6
disk kmsg mmcblk0p14 nvhost-ctxsw-gpu ptyp5 ram7 tty10 tty34 tty58 ttype vfio
emc_freq_min log mmcblk0p2 nvhost-dbg-gpu ptyp6 ram8 tty11 tty35 tty59 ttypf vhci
fb0 loop0 mmcblk0p3 nvhost-gpu ptyp7 ram9 tty12 tty36 tty6 ttyS0 video0
fb1 loop1 mmcblk0p4 nvhost-isp ptyp8 random tty13 tty37 tty60 ttyS1 zero
fd loop2 mmcblk0p5 nvhost-isp.1 ptyp9 rfkill tty14 tty38 tty61 ttyS2 zram0
full loop3 mmcblk0p6 nvhost-msenc ptypa rtc tty15 tty39 tty62 ttyS3 zram1
fuse loop4 mmcblk0p7 nvhost-nvdec ptypb rtc0 tty16 tty4 tty63 ttyTHS1 zram2
gpiochip0 loop5 mmcblk0p8 nvhost-nvjpg ptypc rtc1 tty17 tty40 tty7 ttyTHS2 zram3
gpiochip1 loop6 mmcblk0p9 nvhost-prof-gpu ptypd serial tty18 tty41 tty8 uhid
gps0 loop7 mqueue nvhost-sched-gpu ptype shm tty19 tty42 tty9 uinput
gpu_freq_max loop-control mtd0 nvhost-tsec ptypf snd tty2 tty43 ttyACM0 urandom
gpu_freq_min mapper mtd0ro nvhost-tsecb quadd spidev0.0 tty20 tty44 ttyGS0 v4l
hidraw0 max_cpu_power mtdblock0 nvhost-tsg-gpu quadd_auth spidev1.0 tty21 tty45 ttyp0 vcs
$