On 12/12/2017 6:28 PM, A.W.C. wrote:
yes, I know that Squashfs is read-only filesystem. Tried again, not sure what need be changed here for this specific configuration and filesystems available.

# mknod -m 666 /dev/null c 1 3
mknod: /dev/null: Read-only file system

You say you understand it is read only, but this error message is exactly the problem you are having.  You cannot change things in a directory which is on a read-only filesystem.

It appears you do not have the devtmpfs built into your kernel (the one which comes pre-populated with lots of helpful device nodes), so you will need to use something else, like tmpfs (which comes completely empty, but writable).

Maybe try

mount -t tmpfs none /dev
mknod -m 666 /dev/null c 1 3
# and all the rest of your device nodes


-Mike

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