Here is how the kmem can be statically created:
see man 4 kmem
/dev/mem is typically created by:
- mknod -m 660 /dev/mem c 1 1
- chown root:kmem /dev/mem
The file kmem is the same as mem, except that the kernel virtual memory rather than physical memory is accessed. /dev/kmem is typically created by:
- mknod -m 640 /dev/kmem c 1 2
- chown root:kmem /dev/kmem
/dev/port is similar to mem, but the I/O ports are accessed. It is typically created by:
- mknod -m 660 /dev/port c 1 4
- chown root:mem /dev/port
Here is the description on the difference between kmem and mem.