On Wed, 17 Mar 2021 10:56:34 -0600, Gregory Anders <greg@xxxxxxxxxxxx> wrote:
I switched over to using the miscdevice API and the situation is the
same. Nothing under /dev, but I can see my device under /sys/dev/char
(it now also exists under /sys/devices/virtual/misc/, as expected).
I verified that devtmpfs is enabled in the kernel config
(CONFIG_DEVTMPFS=y and CONFIG_DEVTMPFS_MOUNT=y) and also see that it
is mounted on /dev:
# cat /proc/mounts
root@xilinx-kcu105-2020_2:~# cat /proc/mounts
192.168.0.116:/data/nfs/root / nfs rw,relatime,vers=3,rsize=4096,wsize=4096,namlen=255,hard,nolock,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.0.116,mountvers=3,mountproto=tcp,local_lock=all,addr=192.168.0.116 0 0
devtmpfs /dev devtmpfs rw,relatime,size=1026312k,nr_inodes=185478,mode=755 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
tmpfs /var/volatile tmpfs rw,relatime 0 0
tmpfs /dev tmpfs rw,relatime,size=64k,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600,ptmxmode=000 0 0
I notice that it lists /dev as both devtmpfs (line 2) as well as tmpfs
(the second line from the bottom). Could that be an issue? I'm not
sure how or why /dev is being mounted as tmpfs in addition to
devtmpfs.
Thanks,
Greg
One other data point: there are 3 other misc devices on the system, and
all of them are correctly listed under /dev:
# ls -1 /sys/class/misc
cpu_dma_latency
loop-control
foo0
vga_arbiter
# ls -1 /dev/{cpu_dma_latency,loop-control,vga_arbiter}
/dev/cpu_dma_latency
/dev/loop-control
/dev/vga_arbiter
Greg
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