- @retval EFI_SUCCESS At least one byte of data is available to be read\r
- @retval EFI_NOT_READY No data is available to be read\r
- @retval EFI_DEVICE_ERROR The serial device is not functioning properly\r
+ @retval TRUE At least one byte of data is available to be read\r
+ @retval FALSE No data is available to be read\r