Hello,

I use OBSD on a Soekris target, which uses a compact flash.

I want to limit write accesses on the compact flash, so I mounted / read 
only, with the noatime option. /var is mounted in RAM.

Then, I ran mtree as a simple IDS. I saw that some devices had their 
modification time updated, for example /dev/ptyp0 when I run some 
commands on the soekris target via a ssh connexion.

Yes, I could create a mfs partition for /dev, but I think it is too 
dangerous.

Is there an easy way to tell the kernel to not update modification time
?

Thanks for your answers.