If Dell BIOS is used in your system, you may find
below Control options in Thunderbolt Configuration page in your BIOS
Setup:
Enable Thunderbolt Technology Support (Enabled by
default)
When enabled, the Thunderbolt Technology feature,
and associated ports and adapters are enabled.
When disabled, the Thunderbolt Technology feature
is disabled, and any connected Thunderbolt adapter devices are not
available in pre-boot or within the operating system.
Enable Thunderbolt Boot Support (Disabled by default)
When enabled, the following Thunderbolt adapter features
are enabled during Pre-boot: Thunderbolt adapter boot support, USB
device on Thunderbolt adapter support (including USB boot support).
This allows Thunderbolt adapter peripheral devices and USB devices
connected to the Thunderbolt adapter to be used during BIOS pre-boot.
However, setting this to “Enabled” will override the Security Levels
utilized within the operating system. When this setting is enabled,
any Thunderbolt adapter peripherals and USB devices connected to
the Thunderbolt adapter port prior to booting the system can be used
in pre-boot. As long as the device remains connected, it will continue
to function within the operating system, regardless of the Security
Level set in BIOS.
Enable Thunderbolt Adapter Pre-boot Modules (Disabled
by default)
When enabled, this setting will allow PCIe devices
that are connected through a Thunderbolt adapter (i.e. PCIe devices
behind the Thunderbolt adapter) to execute the PCIe device’s UEFI
Option ROM(s) (if present) during pre-boot.
When disabled, this setting will prevent PCIe device
Option ROMs from executing during pre-boot for PCIe devices connected
behind the Thunderbolt adapter.
NOTE Enabling
the “Enable Thunderbolt Adapter Boot Support“ or “Enable Thunderbolt
Adapter Pre-boot Modules“ options may allow devices connected to the
Thunderbolt adapter during pre-boot to function in the operating
system regardless of the Security Level selected in BIOS Setup. The
device will continue to operate in the operating system until it is
disconnected. When reconnected while within the operating system,
the device will connect according to the Security Level and previous
OS authorizations.
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