Intel Extensible Firmware Interface - Manual (Page 350)

Extensible Firmware Interface Specification
10-56 12/01/02 Version 1.10
Mode Pointer to SERIAL_IO_MODE data. Type SERIAL_IO_MODE is
defined in “Related Definitions” below.
Related Definitions
//*******************************************************
// SERIAL_IO_MODE
//*******************************************************
typedef struct {
UINT32 ControlMask;
// current Attributes
UINT32 Timeout;
UINT64 BaudRate;
UINT32 ReceiveFifoDepth;
UINT32 DataBits;
UINT32 Parity;
UINT32 StopBits;
} SERIAL_IO_MODE;
The data values in the SERIAL_IO_MODE are read-only and are updated by the code that
produces the SERIAL_IO_INTERFACE protocol functions:
ControlMask A mask of the Control bits that the device supports. The device must
always support the Input Buffer Empty control bit.
Timeout If applicable, the number of microseconds to wait before timing out a
Read or Write operation.
BaudRate If applicable, the current baud rate setting of the device; otherwise,
baud rate has the value of zero to indicate that device runs at the
device’s designed speed.
ReceiveFifoDepth The number of characters the device will buffer on input.
DataBits The number of data bits in each character.
Parity If applicable, this is the EFI_PARITY_TYPE that is computed or
checked as each character is transmitted or received. If the device
does not support parity the value is the default parity value.
StopBits If applicable, the EFI_STOP_BITS_TYPE number of stop bits per
character. If the device does not support stop bits the value is the
default stop bit value.