S3_GLOBAL_GBD_REG
WriteReg32(S3_GLOBAL_GBD_REG, bci_enable | S3_LITTLE_ENDIAN | S3_BD64);
WriteReg32(S3_GLOBAL_GBD_REG, bci_enable | S3_LITTLE_ENDIAN | S3_BD64);
WriteReg32(S3_GLOBAL_GBD_REG, bci_enable | S3_BD64 | 0x10000000);
WriteReg32(S3_GLOBAL_GBD_REG, bci_enable | S3_BD64 | 0x10000000);
WriteReg32(S3_GLOBAL_GBD_REG, bci_enable | S3_LITTLE_ENDIAN | S3_BD64);