[Bug 2044549] Re: pxe boot on arm64 stopped working

[Alexsander de Souza]

additional info:

- the machine has a Intel I210-T1 NIC
- when the boot process doesn't work, the UEFI firmware requests the 2 grub files (bootaa64.efi and grubaa64.efi), and I can confirm MAAS serves them correctly and timely. In the machine console we can see that Grub starts and after a pause it drops into the prompt. No request for configuration files reached the MAAS controller. 
- when the process works, I can see requests for multiple configuration files just after MAAS sends the  '.efi' files to the machine

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https://bugs.launchpad.net/bugs/2044549

Title:
  pxe boot on arm64 stopped working

Status in grub2 package in Ubuntu:
  New

Bug description:
  We have a lab with eight arm64 machines which are deployed from MAAS (also on arm64). 
  Two weeks ago we noticed the commissioning in MAAS is not working.
  We can see MAAS sends two files (bootaa64.efi and grubaa64.efi) as requested and then machine goes to grub prompt.
  @alexsander-souza from MAAS team had a look and he suspects grub issue. net_bootp command returns "error: couldn't send  network packet".
  Sometimes when machine is power cycled it can deploy again, but not always.
  Any idea how to debug this?

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