Items needed:
VMWare ESXi 6.0 installer
VMWare Fusion or player
ESXi 5.0 boot files macpro efi boot files.zip
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Create VM in VMWare fusion building to USB attached internal drive.
*Be sure to chose USB drive in the setup
The build shouldn’t take but a couple of minutes.

Once complete mount the /boot partition on your mac
“diskutil list” and figure out what disk is your ESXi
————————– this is my display ——————

/dev/disk6 (external, physical):
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:      GUID_partition_scheme                        *160.0 GB   disk6
1:                        EFI ESXi                    4.2 MB     disk6s1
2:       Microsoft Basic Data                         262.1 MB   disk6s5
3:       Microsoft Basic Data                         262.1 MB   disk6s6
4: 9D275380-40AD-11DB-BF97-000C2911D1B8               115.3 MB   disk6s7
5:       Microsoft Basic Data                         299.9 MB   disk6s8
6: 9D275380-40AD-11DB-BF97-000C2911D1B8               2.7 GB     disk6s9
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Type “diskutil mount /dev/disk6s1” or whatever disk is yours
once mounted open and replace the following files with the files from the link above
/Volumes/EFI/BOOT/BOOTIA32.EFI
/Volumes/EFI/BOOT/BOOTx64.EFI

/Volumes/EFI/VMware/mboot32.efi
/Volumes/EFI/VMware/mboot64.efi

back to the terminal and type “diskutil unmountDisk /dev/disk6” where it is your disk not the partition

Unplug and install in your ancient MacPro 1,1 (yes this says 2,1 but it is really a 2006 1,1) just like my early 2009 Mac Pro is a 6-core 3.33 GHz 🙂
Enjoy