hi @xinliang - thanks for raising this bug, and for the info. 
I've got my way through to a grub build (I'm going to append some extra notes 
to your instructions) but, I'm unclear about where the: 

$ sudo apt install ./*.deb

is supposed to be applied - are you doing this on your pxe/tftp server?
Or does this need to be in the image that is being netbooted? (or both?)

If it's going on the pxe/tftp server, what files is it
providing/replacing to resolve the bug (ie is it updating a bootx64.efi

As promised - a little extra detail on the build notes:

$ git clone -b applied/ubuntu/focal-updates 
$ cd grub2
$ git cherry-pick a6838bbc6726ad624bd2b94991f690b8e9d23c69 # this will throw an 
$ git remote add upstream https://git.savannah.gnu.org/git/grub.git
$ git fetch upstream
$ git cherry-pick a6838bbc6726ad624bd2b94991f690b8e9d23c69
$ dpkg-buildpackage -rfakeroot -b

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu.

  PXE load Focal initrd.img-5.4.0-42-generic always timeout

Status in grub2 package in Ubuntu:
Status in initramfs-tools package in Ubuntu:

Bug description:
  PXE booting Focal initrd always gets a timeout, but PXE booting Bionic initrd 
  error: timeout reading `initrd.img-5.4.0-42-generic'.

  menuentry "boot_iscsi"  {
      linux vmlinuz-5.4.0-42-generic  ...
      initrd initrd.img-5.4.0-42-generic

  grub, kernel and initrd get from Focal boot dir
  $ cp /usr/lib/grub/arm64-efi-signed/grubnetaa64.efi.signed 
  $ cp /boot/vmlinuz-5.4.0-42-generic  ~/tftproot/
  $ cp /boot/initrd.img-5.4.0-42-generic ~/tftproot/

  Real aarch64 server or qemu-system-aarch64 machine

  $ apt search grub-efi-arm64
  Sorting... Done
  Full Text Search... Done
  grub-efi-arm64/focal-updates,focal-security,now 2.04-1ubuntu26.2 arm64 
    GRand Unified Bootloader, version 2 (ARM64 UEFI version)

  grub-efi-arm64-bin/focal-updates,focal-security,now 2.04-1ubuntu26.2 arm64 
    GRand Unified Bootloader, version 2 (ARM64 UEFI modules)

  grub-efi-arm64-dbg/focal-updates,focal-security 2.04-1ubuntu26.2 arm64
    GRand Unified Bootloader, version 2 (ARM64 UEFI debug files)

1.142.4+2.04-1ubuntu26.2 arm64 [installed]
    GRand Unified Bootloader, version 2 (EFI-ARM64 version, signed)

  grub-efi-arm64-signed-template/focal-updates,focal-security 2.04-1ubuntu26.2 
    GRand Unified Bootloader, version 2 (ARM64 UEFI signing template)

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 20.04 LTS
  Release:        20.04
  Codename:       focal
  $ uname -a
  Linux j12-d05-07 5.4.0-42-generic #1 SMP Tue Jul 7 02:48:00 GMT 2020 aarch64 
aarch64 aarch64 GNU/Linux

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