Jay L. T. Cornwall wrote:

All I need is:
  * / partition to work in read-only mode.
  * Volatile directories such as /root, /var and /tmp to be populated
    into a memory filesystem on boot.

OK, this turned out to be easier after I spent some time reading through the /etc/rc.initdiskless script.

All that was needed was to create:
  /conf/base/root
  /conf/base/tmp
  /conf/base/var

And fill them with the files to be populated in a memory filesystem on reboot. A md_size file inside each dir tweaks the size of the memory disks according to the script.

Then touch /etc/diskless and the magic happens!

--
Jay L. T. Cornwall
http://www.jcornwall.me.uk/
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