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PXE attributes are available under the BIOS component while the BIOS is in Uefi BootMode.
When one of the PxeDevXEnDis (1,2,3,4) attributes is enabled, a new associated PXE device appears under the UefiBootSeq. The PxeDevXInterface attribute must be mapped to a bootable network device.
In the following example, PxeDev1EnDis is set to Enabled and PxeDev1Interface is assigned to NIC.Embedded.1-1-1.
<Component FQDD="BIOS.Setup.1‐1">
<Attribute Name="PxeDev1EnDis">Enabled</Attribute>
<Attribute Name="PxeDev1Interface">NIC.Integrated.1‐1‐1</Attribute>
<Attribute Name="PxeDev1Protocol">IPv4</Attribute>
<Attribute Name="PxeDev1VlanEnDis">Disabled</Attribute>
<Attribute Name="PxeDev1VlanId">1</Attribute>
<Attribute Name="PxeDev1VlanPriority">0</Attribute>
<Attribute Name="UefiBootSeq">NIC.PxeDevice.1‐1</Attribute>
</Component>
If PxeDev1EnDis is Disabled, this device (NIC.Embedded.1-1-1 or NIC.PxeDevice.1-1) would not appear as a bootable device.
Some PXE options are available in legacy (Bios) BootMode, as described in LegacyBootProto and PXE.