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//0x20 bytes (sizeof)
struct _FIRMWARE_INFORMATION_LOADER_BLOCK
{
    ULONG FirmwareTypeEfi:1;                                                //0x0
    ULONG Reserved:31;                                                      //0x0
    union
    {
        struct _EFI_FIRMWARE_INFORMATION EfiInformation;                    //0x8
        struct _PCAT_FIRMWARE_INFORMATION PcatInformation;                  //0x8
    } u;                                                                    //0x8
};