EFI Preboot Guidelines and Windows 8 UEFI Secure Boot for HP Business Notebooks and Desktops PPS Business Notebook and Desktop Technical white paper

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 The legacy Boot Order, as it exists when Legacy Support is enabled
 A UEFI Boot Order list when Legacy Support is disabled
For the UEFI F10 Static Boot Order, the BIOS assigns certain Boot numbers for the fixed devices in the system. For
example, Boot0000 can be OS Boot Manager for a hard drive, Boot0001 can be PXE IPV4, and Boot0002 can be for a
built-in DVD. Certain HP-supported UEFI apps should also be listed, such as HP UEFI diagnostics. Win8 will add Boot
numbers for “OS Boot Manager”, for the hard drive, and “Windows to go” for the USB disk.
When Legacy Support is disabled, the BIOS is in native UEFI mode and POST time is critical. If the generic USB device or
USB hard drive is not listed first in the Boot Order and the next boot is not set to “USB Hard Drive“ or “generic USB
device” by the OS, the BIOS will not enumerate USB. Thus any removable USB devices attached to the system will not be
enumerated and Boot Order will not show the detailed USB device information. The only entry will be the generic USB
device, and there be no external USB optical drive or external USB disk devices in the F10 Boot Order.
When no button is pressed during POST, the BIOS will pass this static Boot Order list to the OS. In turn, the OS will
display it in its Advanced Options.
Figure 6: F10 Boot Order when Legacy Support is enabled and disabled
F10 Boot Order when Legacy Support Is enabled. Both
UEFI and legacy Boot options are shown. Notebook
Ethernet IPV4 and IPV6 boot options are disabled by
default due to long delays.
[✔] Legacy Support
[ ] Secure Boot
Boot Options
[✔] Legacy PXE Internal NIC boot
[ ] UEFI PXE IPV4 NIC boot
[ ] UEFI PXE IPV6 NIC boot
UEFI Boot Order
OS Boot Manager
USB Hard Drive
Notebook Ethernet IPV4
Notebook Ethernet IPV6
Notebook Upgrade Bay
eSata Drive
SD Card
HP Hypervisor
Generic USB Device
Customized Boot
Delete Add
Legacy Boot Order
Notebook Upgrade Bay
Notebook Hard Drive
USB Floppy
USB CD-ROM
USB Hard Drive
Notebook Ethernet
SD Card
Dock Upgrade Bay
eSata Drive
F10 Boot Order when Legacy Support is disabled. All
legacy boot order items are dynamically removed.
Notebook Ethernet IPV4 and IPV6 boot options are
enabled by default.
[ ] Legacy support
[✔] Secure Boot
Boot Options
[✔] UEFI PXE IPV4 NIC boot
[✔] UEFI PXE IPV6 NIC boot
[✔] USB
UEFI Boot Order
OS Boot Manager
USB Hard Drive
Notebook Ethernet IPV4
Notebook Ethernet IPV6
Notebook Upgrade Bay
eSata Drive
SD Card
HP Hypervisor
Generic USB Device
Customized Boot
Delete Add
When delete is selected, only those entries added by
OS/User can be deleted. i.e. OS Boot Manager,
Customized Boot.
When add is selected, the user can add a customized boot
path