VariableList

NVIDIA Defined variables

Feature Name: Variables defined by NVIDIA UEFI

PI Phase supported: DXE,RT

SMM Required: No

Purpose

Provides a centralized list of configuration entries used in NVIDIA systems

Variable GUIDs

Name	Guid	Use	Key
gNVIDIATokenSpaceGuid	ed3374ef-767b-42fa-af70-db520a392822	Used for variables that are internal to firmware, firmware can change structure at any point if it can handle old data	Internal
gNVIDIAPublicVariableGuid	781e084c-a330-417c-b678-38e696380cb9	Public documented variables, can not change only deprecate	Public

Variables

Name	Space	Description	Attributes	Structure	Deprecated
BootChainFwCurrent	Public	Currently booting firmware	BS|RT	UINT32 0-A partition 1-B partition
BootChainOsCurrent	Public	Currently booting OS partition	BS|RT	UINT32 0-A partition 1-B partition
BootChainOsOverride	Public	Override to force OS partition	BS|NV|RT	UINT32 0x00-A partition 0x01-B partition 0xFF-Follow firmware If undefined boot follows firmware chain
L4TDefaultBootMode	Public	Behavior of L4T launcher Select starting option for boot Boot is normally via grub, then extlinux, then boot.img if previous boot option was not supported. Recovery image is only used if directly selected.	BS|NV|RT	UINT32 0x00 - Boot via Grub 0x01 - Boot via extlinux in ext4 fs 0x02 - Boot via boot.img partition 0x03 - Boot recovery image 0xff - Default behavior If undefined or invalid boot is boot starts with grub
KernelCommandLine	Public	Additional command line options to pass to kernel	BS|NV	CHAR16 string
KernelCommandLineLast	Internal	Last overriden kernel command line to make sure we don't replace multiple times	BS|NV	CHAR16 string
EnablePcieInOS	Internal	Enable PCIe nodes in ACPI, used to expose non-standard device so requires OS support	BS|NV	UINT8 0 - Disabled 1 - Enabled	Yes only used for T194
PCIeResourceConfig	Internal	Expose PCIe configuration form	BS	UINT8 0 - Disabled 1- Enabled Only set to 1 via PCD for T194 if ACPI not enabled	Yes only used for t194
PCIeInOsConfig	Internal	Expose PCIe in OS enable option in PCIe configuration form	BS	UINT8 0 - Disabled 1- Enabled Only set to 1 via PCD for T194 if ACPI not enabled	Yes only used for t194
QuickBootEnabled	Public	Should UEFI skip full connection and make other boot speed improvements	BS|NV	UINT8 0 - Disabled 1- Enabled Default is driven by PCD, set to 1 on our targets
SerialTypeConfig	Internal	Used to limit which UART options are displayed on configuration form. Set	BS	UINT8 0x00 - 16550 0x01 - SBSA 0xFF - Undefined Set based on uart type on target via PCD
SerialPortConfig	Internal	Used to direct ACPI generation for serial port	BS|NV	UINT8 0x00 - Full 16550 support in SPCR 0x01 - Nvidia 16550 support in SPCR 0x02 - Nvidia 16550 support in DBG2 0x03 - SBSA UART in SPCR 0x04 - SBSA Uart in DBG2 0xFF - Disabled Default based on PCD
"Ethernet node name in DTB"	Internal	Override for MAC address. Should try to create better naming for override	BS|NV	6 byte array
FmpCapsuleSinglePartitionChain	Public	Boot chain to update with single-image development capsule	BS|NV|RT	UINT8 0-A partition 1-B partition
RTC_OFFSET	Internal	Offset from pmic stored time to current time in seconds	BS|NV	INT64
PlatformBootOrderSet	Internal	Indicates that initial boot order override is complete so that user changes are respected	BS|NV	BOOLEAN
PlatformConfigData	Internal	Hash of dtb/uefi to detect firmware update to override quick boot settings	BS|NV	typedef struct {UINT8 DtbHash[SHA256_DIGEST_SIZE]; CHAR8 UEFIVersion[UEFI_VERSION_STRING_SIZE]; OS_HARDWARE_DESCRIPTION OsHardwareDescription; } PLATFORM_CONFIGURATION_DATA;