MdePkg[all]  1.08
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gEfiSerialIoProtocolGuid

Include/Protocol/SerialIo.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiSerialIoProtocolGuid{ 0xBB25CF6F, 0xF1D4, 0x11D2, { 0x9A, 0x0C, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0xFD }}

Refer to Header File

MdePkg/Include/Protocol/SerialIo.h