You may need "nfit" module in the initrd too.

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https://bugs.launchpad.net/bugs/1981385

Title:
  initrd lacks modules to mount boot image from http boot

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  If you use UEFI http boot to boot an image (rather than an EFI
  executable) and get all the way to a normal userspace, you can access
  the boot image as /dev/pmem0. But this is not accessible in the
  initrd; presumably some modules are missing. Dimitri added some
  modules that are clearly going to be necessary (kernel/drivers/nvdimm)
  in 0.140ubuntu14 and I added kernel/drivers/dax too in local
  experiments but this appears not to be enough to get it to appear.

  This is desirable because then you can just feed an installer ISO to a
  machine via http boot and the installer just works as normal (the
  speed and, uh, quality, of the implementation of HTTP in a given
  machine's firmware may mean this isn't always the best option but it
  would be nice if it worked in case someone's machine actually does
  this well).

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