Base address of 16550 serial port registers in MMIO or I/O space. Default is 0x3F8.
Base address of serial port registers.
PCD Information
| Name | Token Space | Token number | Data Type | Default Value |
| PcdSerialRegisterBase | gEfiMdeModulePkgTokenSpaceGuid | 0x00020002 | UINT64 | 0x03F8 |
1.8.6 
