[Unionfs] Umounting initrd image

[Ram Kumar]

Hi,
      I could sucessfully boot into a union which is created by merging two
of my hard drive partitions (containing a readonly root file system in one
and a empty readwrite partion in other). This is handled by linuxrc script
located in my initrd image whose only purpose is to create a union and
pivot_root into the new rootfs. Now Iam wondering whether there is a proper
way to free the resources (from my embedded linux target) by umounting the
initrd image before init is launched. Is this possible ?
regards.
ram.
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