EFI_DEVICE_PATH_PROTOCOL.SubType

< 0x02 ACPI Device Path. < 0x03 Messaging Device Path. < 0x04 Media Device Path. < 0x05 BIOS Boot Specification Device Path. < 0x7F End of Hardware Device Path. +////< Varies by Typ

struct EFI_DEVICE_PATH_PROTOCOL
UINT8 SubType;

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