[Bug 1521612] Re: Continued TFTP timeouts when PXE booting via grub

[Andrew Cloke]

>From comment #11 of LP#1508893:

Looks only the commit 49426e9fd2( efinet: open Simple Network Protocol exclusively) isn't enough, and the
following three commits are required too for grub working well on HP m400 ARM64 server:

      7b386b703154c0901c4616(efidisk: move device path helpers in core for efinet)
      c52ae40570c3bfbcca22d21(efinet: skip virtual IPv4 and IPv6 devices when enumerating cards)
     f348aee7b33dd85e7da62b(efinet: enable hardware filters when opening interface)

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https://bugs.launchpad.net/bugs/1521612

Title:
  Continued TFTP timeouts when PXE booting via grub

Status in grub2 package in Ubuntu:
  New

Bug description:
  [Impact]
  While the Grub2 patches described in LP#1508893 reduce the TFTP time-out, HP ProLiant m400 servers when booting via UEFI, may still experience TFTP timeouts.

  [Test Case]
  PXE boot a UEFI-based system (d-i or MAAS) and monitor the time it takes for GRUB to download the kernel/initrd. tcpdump will show TFTP timeouts and packet retries, and it can take on the order of minutes to begin running the kernel.

  [Regression Risk]
  The fix is restricted to UEFI-based systems.

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