Dell R515 owner manual More information, TPM keys prior to enabling this option

Option	Description
Setup Password	Restricts access to the System Setup program by using a
	setup password.
	NOTE: See "Using the System Password" on page 72 for
	more information.
Password Status	When Setup Password is assigned and this field is
(Unlocked default)	Locked, the system password cannot be changed or
	disabled at system start-up.
	See "Using the System Password" on page 72 for more
	information.
TPM Security	Sets the reporting of the Trusted Platform Module
(Off default)	(TPM) in the system.
	If Off, the presence of the TPM is not reported to the
	operating system.
	If On with Pre-boot Measurements, the system reports
	the TPM to the operating system and stores the pre-boot
	measurements to the TPM during POST.
	If On without Pre-boot Measurements, the system
	reports the TPM to the operating system and bypasses
	pre-boot measurements.
TPM Activation	When set to Activate, the TPM is enabled to default
(No Change default)	settings. When set to Deactivate, the TPM is disabled.
	The No Change state initiates no action. The operational
	state of the TPM remains unchanged (all user settings for
	the TPM are preserved).
	NOTE: This field is read-only when TPM Security is set
	to Off.
TPM Clear	CAUTION: Clearing the TPM will lose all encryption
(No default)	keys in the TPM. This option prevents booting to the
	operating system and results in data loss if the
	encryption keys cannot be restored. Back up the
	TPM keys prior to enabling this option.
	When set to Yes, all TPM contents are cleared.
	NOTE: This field is read-only when TPM Security
	is set to Off.

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Using the System Setup Program and UEFI Boot Manager