Introduction

  differences between initramfs and initrd:

    ramfs vs block
      - less memory
      - dynamic resizing, no limits
      - rootfs always mounted for same reason pid1 unkillable.

    archive vs image
      - no filesystem driver
        - ramfs tiny, always loaded in 2.6.  Wrapper around vfs cache.

    bundled vs unbundled
      - both available to ramfs

    init vs linuxrc
      - linuxrc sucky.
        - Not PID 1.
          - unpredictable PID, killable, zombies, etc.
        - strange flow control, unnecessarily complicated.
          - setup then return to kernel so it can mount root?  (nfs?)
          - you're right there already, just do it yourself.