@george1421 I can confirm my workaround worked, and sending 64bit kernel and initrd images boots FOS no problem.
From fog inventory:
System Manufacturer Dell Inc.
System Product OptiPlex 9020 AIO
System Version 01
System Serial Number 7DT9322
System UUID 4c4c4544-0044-5410-8039-b7c04f333232
System Type Type: All In One
BIOS Vendor Dell Inc.
BIOS Version A08
BIOS Date 05/15/2014
Motherboard Manufacturer Dell Inc.
Motherboard Product Name 0GXX2X
Motherboard Version A00
Motherboard Serial Number /7DT9322/CN7443133R001K/
Motherboard Asset Tag Not Specified
CPU Manufacturer Intel
CPU Version Intel Core i5-4570S CPU @ 2.90GHz
CPU Normal Speed Current Speed: 2900 MHz
CPU Max Speed Max Speed: 3000 MHz
Memory 7.68 GiB
Hard Disk Model KINGSTON SA400S37240G
Hard Disk Firmware SAJ20104
Hard Disk Serial Number 50026B7685C378B6
Chassis Manufacturer Dell Inc.
Chassis Version
Chassis Serial 7DT9322
Chassis Asset Not Specified
GPU-0 Vendor Advanced Micro Devices
GPU-0 Product Inc. [AMD/ATI]
GPU-1 Vendor Intel Corporation
GPU-1 Product Mars [Radeon HD 8670A/8670M/8750M / R7 M370]
Regards,