UEFI (Unified Extensible Firmware Interface) replaces the older BIOS firmware interface on newer computer systems. UEFI handles network booting in a different way than BIOS computers handle network booting. Thus, due to the UEFI standard, the options available for booting UEFI devices differs somewhat from booting BIOS devices.
With BIOS devices the ability to Press F8 and display a PXE Boot menu with a selection of choices such as Local Boot, WinPE Boot Menu, WinPE Provisioning, etc are available.
The UEFI limitations make it so booting to a menu is not possible.
In order to send provisioning tasks to a UEFI device, they must be in the devices list and pre-scheduled prior to booting up the device.
How to Schedule provisioning tasks to UEFI devices
1. Within the Provisioning Tool, right-click the desired Provisioning template and choose "Schedule Template"
2. Target computers must be in the Devices list or be added by adding a "Bare Metal Server" record.
A "Bare Metal Server" record is simply a method of adding an entry in the Device list to represent an as yet unmanaged device.
To add Bare Metal Server entries to your devices list, follow these steps:
A. Expand the Configuration section in the Network view of the LDMS console
B. Right-click "Bare Metal Server"
C. Click "Add Devices"
D. Select a desired identifier type (typically MAC address) and then click "Add"
E. Enter a name for the computer, and the identifier (such as MAC Address)
(Note: You can add multiple computers by entering multiple names an identifiers)F. Click OK when finished.
3. Make sure the targeted devices are off then start scheduled provisioning template.
4. Once the scheduled task is in pending status, boot the client computer computer and press F12.
(F12 is the default key to network boot most computers. This may vary with some vendors)
5. From this point the Schedule task should change to an active state and you should start seeing the client device downloading the boot_x64.sdi and boot_x64.wim files and continuing into Windows PE.