with 1st enet:

   Device Path Acpi(HWP0002,0)/Pci(3|0)/Mac(00306E39B62F)
Running LoadFile()

PXE-E12: Could not detect network connection.  Check cable.

------------------------------------------------------------------------

with 2nd enet and "loader.efi.stock":

    Device Path Acpi(HWP0002,100)/Pci(2|0)/Mac(00306E393639)
Running LoadFile()

CLIENT MAC ADDR: 00 30 6E 39 36 39
CLIENT IP: 69.147.83.83  MASK: 255.255.255.128  DHCP IP: 209.131.40.155
GATEWAY IP: 69.147.83.3  69.147.83.1

TSize...-
PXE-E18: Timeout.  Server did not respond.

------------------------------------------------------------------------

with 2nd enet and "loader.efi.marcel":

   Device Path Acpi(HWP0002,100)/Pci(2|0)/Mac(00306E393639)
Running LoadFile()

CLIENT MAC ADDR: 00 30 6E 39 36 39
CLIENT IP: 69.147.83.83  MASK: 255.255.255.128  DHCP IP: 69.147.83.43
GATEWAY IP: 69.147.83.3  69.147.83.1

TSize..
PXE-E23: Client received TFTP error from server.
PXE-E98: Code: 1h  File not found

------------------------------------------------------------------------

with 2nd enet and default:

    Device Path Acpi(HWP0002,100)/Pci(2|0)/Mac(00306E393639)
Running LoadFile()

CLIENT MAC ADDR: 00 30 6E 39 36 39
CLIENT IP: 69.147.83.83  MASK: 255.255.255.128  DHCP IP: 209.131.40.155
GATEWAY IP: 69.147.83.3  69.147.83.1

TSize.../
PXE-E18: Timeout.  Server did not respond.

hmm.  try again:

   Device Path Acpi(HWP0002,100)/Pci(2|0)/Mac(00306E393639)
Running LoadFile()

CLIENT MAC ADDR: 00 30 6E 39 36 39
CLIENT IP: 69.147.83.83  MASK: 255.255.255.128  DHCP IP: 69.147.83.43
GATEWAY IP: 69.147.83.3  69.147.83.1

TSize.Running LoadFile()

TFTP.

(then "load failed [unsupported]")

------------------------------------------------------------------------

now with *.efi moved to /a/nfs/tftpboot:

    Device Path Acpi(HWP0002,100)/Pci(2|0)/Mac(00306E393639)
Running LoadFile()

CLIENT MAC ADDR: 00 30 6E 39 36 39
CLIENT IP: 69.147.83.83  MASK: 255.255.255.128  DHCP IP: 69.147.83.43
GATEWAY IP: 69.147.83.3  69.147.83.1

TSize.Running LoadFile()

TFTP.Consoles: EFI console
Image base: 0x000000407bd72000

FreeBSD/ia64 EFI boot, Revision 1.2
(marcel@pluto1.freebsd.org, Tue Dec  1 21:28:55 UTC 2009)
State                 = 2
HwAddressSize         = 6
MediaHeaderSize       = 14
MaxPacketSize         = 1500
NvRamSize             = 512
NvRamAccessSize       = 4
ReceiveFilterMask     = 1f
ReceiveFilterSetting  = 5
MaxMCastFilterCount   = 8
MCastFilterCount      = 8
MCastFilter           = { 00:30:6e:39:b6:2f ff:ff:ff:ff:ff:ff 00:30:6e:39:b6:2f fb:fb:fb:fb:fb:fb fb:fb:fb:fb:fb:fb fb:fb:fb:fb:fb:fb fb:fb:fb:fb:fb:fb fb:fb:fb:fb:fb:fb }
CurrentAddress        = 00:30:6e:39:b6:2f
BroadcastAddress      = ff:ff:ff:ff:ff:ff
PermanentAddress      = 00:30:6e:39:b6:2f
IfType                = 1
MacAddressChangeable  = 1
MultipleTxSupported   = 0
MediaPresentSupported = 1
MediaPresent          = 0
bootp: no reply
No response for RARP request
net_open: RARP failed                                                           
[...]
bootp: no reply
No response for RARP request
net_open: RARP failed
can't load 'kernel'