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gEfiLegacySpiSmmFlashProtocolGuid

Include/Protocol/LegacySpiSmmFlash.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiLegacySpiSmmFlashProtocolGuid{ 0x5e3848d4, 0x0db5, 0x4fc0, { 0x97, 0x29, 0x3f, 0x35, 0x3d, 0x4f, 0x87, 0x9f }}

Refer to Header File

MdePkg/Include/Protocol/LegacySpiSmmFlash.h