FreeBSD 9.0 - GPT boot problems?

[Torfinn Ingolfsen]

Just a short update on this machine (Acer Aspire X1470) and the GPT / UEFI situation.

Today I set up another partition, EFI system partition. The partyitions now looks like this:
root at kg-vm2# gpart show ada0
=>       34  250069613  ada0  GPT  (119G)
         34        128     1  freebsd-boot  (64k)
        162  119537664     2  freebsd-ufs  (57G)
  119537826    8388608     3  freebsd-swap  (4.0G)
  127926434  121634816     4  freebsd-ufs  (58G)
  249561250     204800     5  efi  (100M)
  249766050     303597        - free -  (148M)

I formatted the partition like this: 
root at kg-vm2# newfs_msdos -F32 /dev/ada0p5
newfs_msdos: trim 50 sectors to adjust to a multiple of 63
/dev/ada0p5: 204512 sectors in 12782 FAT32 clusters (8192 bytes/cluster)
BytesPerSec=512 SecPerClust=16 ResSectors=32 FATs=2 Media=0xf0 SecPerTrack=63 Heads=16 HiddenSecs=0 HugeSectors=204750 FATsecs=100 RootCluster=2 FSInfo=1 Backup=2

I have tried putting an EFI shell on it (I got the idea from this[1] page, I have tried both the 1.0 and 2.0 x64 shell), like this:
root at kg-vm2# mount -t msdosfs /dev/ada0p5 /mnt
root at kg-vm2# ls -l /mnt
total 848
drwxr-xr-x  1 root  wheel    8192 Aug  3 14:30 EFI
drwxr-xr-x  1 root  wheel    8192 Aug  3 16:21 boot
-rwxr-xr-x  1 root  wheel  847232 Aug  3 14:56 shellx64.efi
root at kg-vm2# ls -l /mnt/boot
total 760
-rwxr-xr-x  1 root  wheel  771072 Aug  3 16:23 bootx64.efi
root at kg-vm2# ls -l /mnt/EFI
total 16
drwxr-xr-x  1 root  wheel  8192 Aug  3 14:30 FreeBSD
drwxr-xr-x  1 root  wheel  8192 Aug  3 15:06 boot
root at kg-vm2# ls -l /mnt/EFI/boot
total 760
-rwxr-xr-x  1 root  wheel  771072 Aug  3 15:29 bootx64.efi

but no dice - it is not working, it still prints "ERROR: No boot disk has been detected or the disk has failed."
when I try to boot from this disk.
How do I figure out where this UEFI firmware that Acer has put in this machine is getting it's boot manager and or boot loader from?
I tried running 'strings -f' on the BIOS file (sorry, UEFI firmware), that got me all the EFI error messages, but nothing useful.
Googling didn't help either.

References:
1) https://wiki.archlinux.org/index.php/Unified_Extensible_Firmware_Interface
-- 
Torfinn Ingolfsen <torfinn.ingolfsen at getmail.no>