From PhoenixWiki

Prototype

typedef enum {
  EfiDriverDiagnosticTypeStandard = 0,
  EfiDriverDiagnosticTypeExtended = 1,
  EfiDriverDiagnosticTypeManufacturing = 2,
  EfiDriverDiagnosticTypeMaximum
} EFI_DRIVER_DIAGNOSTIC_TYPE;

Description

Diagnostic Type	Description
EfiDriverDiagnosticTypeStandard	Performs standard diagnostics on the controller. This diagnostic type is required to be supported by all implementations of this protocol.
EfiDriverDiagnosticTypeExtended	This is an optional diagnostic type that performs diagnostics on the controller that may take an extended amount of time to execute.
EfiDriverDiagnosticTypeManufacturing	This is an optional diagnostic type that performs diagnostics on the controller that are suitable for a manufacturing and test environment.

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