So there's a later commit which adds a command-line option to force use
of ramfs:

commit 6e19eded3684dc184181093af3bff2ff440f5b53
Author: Rob Landley <r...@landley.net>
Date:   Wed Sep 11 14:26:13 2013 -0700

    initmpfs: use initramfs if rootfstype= or root= specified
    
    Command line option rootfstype=ramfs to obtain old initramfs behavior, and
    use ramfs instead of tmpfs for stub when root= defined (for cosmetic
    reasons).

Can you try adding rootfstype=ramfs to the kernel parameters and see if
this works? Would you be able to do this for cases where you really need
ramfs?

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https://bugs.launchpad.net/bugs/1311987

Title:
  deploy-ironic ramdisks do not boot:  Failed to execute /init (error
  -28)

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