[Bug 1508893] Re: TFTP timeout on ARM64 hw when booting from grub that was PXE loaded

[Newell Jensen]

Ming,

Trying to use your bootnetaa64.efi file from
http://kernel.ubuntu.com/~ming/bugs/1508893/bootnetaa64.efi

I am not able to test this because I cannot PXE boot:

TianoCore 2.0.0 UEFI 2.4.0 Sep  1 2015 12:48:07
CPU: APM ARM 64-bit Strega Rev A2 2400MHz PCP 2400MHz
     32 KB ICACHE, 32 KB DCACHE
     SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 66MHz
Board: X-Gene Merlin Board
Slimpro FW:
	Ver: 3.4 (build 2015/07/22)
	PMD: 980 mV
	SOC: 950 mV
The default boot selection will start in   3 seconds
[1] ubuntu
[2] PXE on MAC :3C
[3] nfs boot via TFTP
[4] Shell
[5] Boot Manager
[6] Reboot
[7] Shutdown
Start: 2
..PXE-E23: Client received TFTP error from server.
[1] ubuntu
[2] PXE on MAC :3C
[3] nfs boot via TFTP
[4] Shell
[5] Boot Manager
[6] Reboot
[7] Shutdown
Start: 2
..PXE-E23: Client received TFTP error from server.
[1] ubuntu
[2] PXE on MAC :3C
[3] nfs boot via TFTP
[4] Shell
[5] Boot Manager
[6] Reboot
[7] Shutdown
Start:

-- 
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Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/1508893

Title:
  TFTP timeout on ARM64 hw when booting from grub that was  PXE loaded

Status in grub2 package in Ubuntu:
  New

Bug description:
  This issue was discovered  with Ubuntu Wily (15.10) on a currently in
  development ARM64 HW.

  When loading kernel via tftp in grub on this hardware, the system
  stops receiving new packets (times out )  after receiving initial few
  tens of tftp data packets , which then causes kernel load failure.

  Running tcpdump before loading kernel in grub menu shows timeouts
  occurring,  as captured in the below log  :

        http://kernel.ubuntu.com/~ming/grub/apm.tcpdump

  Following are the  detailed reproduction steps :

  1) setup PXE boot entry in UEFI(no any parameter to grub)
  2) build one grub from upstream (and/or Wily)  and put it in PXE&TFTP server
  3) setup grub config, suppose the shape is like below:
       menuentry 'Install for arm64' {
            linux /ubuntu-installer/arm64/Image --- console=ttyS0,115200
            initrd /ubuntu-installer/arm64/initrd.gz
      }
  4) start PXE booting in UEFI
  5) grub prompt is coming
  6) select 'Install for arm64' menu item and press 'enter' to start
  loading kernel
  7) then hangs inside loading kernel

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