[MinnowBoard] Using UART2 as terminal output

[vijaikumar k]

Hi All,



Our customized board is based on Minnow Board Reference design and we are
using the MinnowBoard UEFI as a bootcode.

Minnow board UEFI is configured UART0 as debug console. In our customized
board UART2 is used as debug console hence we have done the below
modification but it is not working still.

Can you please help us to fix this issue?



The following are the steps taken from UEFI Firmware side to output debug
information to UART2 port instead of UART0 used by MinnowBoard reference
design. For each of the step mentioned below a Firmware is built and is
tested on custom board.  All the attempts has failed. The line numbers
mentioned below are for indicative purposes only and may vary.

Step 1 :

File

MinnowBoardIntelRuPkg\Platform.dsc

Line No

213

Original Value

DEFINE DEBUG_UART_NUMBER = 0

Modified Value

DEFINE DEBUG_UART_NUMBER = 2



Step 2:

File

IntelEg20tRuPkg\IntelEg20tRuPkg.dec

Line No

132

Original Value

gIntelEg20tRuTokenSpaceGuid.PcdIohUartPortNumber|0|UINT8|0x20000001

Modified Value

gIntelEg20tRuTokenSpaceGuid.PcdIohUartPortNumber|2|UINT8|0x20000001



Step 3:

File

MinnowBoardIntelRuPkg\Platform.dsc

Line No

1386

Original Value

gUart16550PciTokenSpaceGuid.PcdSerialPciDeviceInfo|{0x17, 0x00, 0x00, 0x00,
0x0A, 0x01, 0xFF}

Modified Value

gUart16550PciTokenSpaceGuid.PcdSerialPciDeviceInfo|{0x17, 0x00, 0x00, 0x00,
0x0A, 0x03, 0xFF}

Description

Updated the PCIDeviceInfo PCD to store the Device and Function number of
UART2



File

MinnowBoardIntelRuPkg\Platform.dsc

Line No

1380

Original Value

gUart16550PciTokenSpaceGuid.PcdSerialExtendedTxFifoSize|256

Modified Value

gUart16550PciTokenSpaceGuid.PcdSerialExtendedTxFifoSize|64

Description

Updated the size of UART 2 Tx FIFO



Step 4:

File

MinnowBoardIntelRuPkg\Platform.dsc

Line No

1375

Original Value

gIntelEg20tRuTokenSpaceGuid.PcdEg20tUartSerialIoEnableMask|0x07

Modified Value

gIntelEg20tRuTokenSpaceGuid.PcdEg20tUartSerialIoEnableMask|0x04

Description

Enabled only UART 2 and masked all other UART ports



Step 5:

File

IntelEg20tRuPkg\IntelEg20tRuPkg.dec

Line No

239

Original Value

gIntelEg20tRuTokenSpaceGuid.PcdEg20tUartSerialIoEnableMask|0x07|UINT8|0x2000000D

Modified Value

gIntelEg20tRuTokenSpaceGuid.PcdEg20tUartSerialIoEnableMask|0x04|UINT8|0x2000000D

Description

Enabled only UART 2 and masked all other UART ports


Regards
Vijai Kumar K
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