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Date: Sat, 10 Oct 2015 09:53:13 +0200
From: "Herbert J. Skuhra" <herbert@oslo.ath.cx>
To: freebsd-questions@freebsd.org
Subject: Re: mount: tmpfs: Operation not supported by device
Message-ID: <20151010075313.GA50755@oslo.ath.cx>
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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