mount: tmpfs: Operation not supported by device

[Herbert J. Skuhra]

On Sat, Oct 10, 2015 at 02:14:25PM +0800, Romu wrote:
> Hi,
> 
> I can't mount tmpfs:
> 
> > sudo mount /tmp
> mount: tmpfs: Operation not supported by device
> 
> In my fstab:
> tmpfs   /tmp   tmpfs   rw      0       0
> 
> My kernel amd64 config:

There is no "options TMPFS" in your kernel config.
Does tmpfs.ko exist in /boot/kernel? Can you load it?
What's the output of:

# kldstat
# kldload tmpfs

-- 
Herbert