From db662a64a62a42e2c8cdc3ab86c1a6b832f2dc4e Mon Sep 17 00:00:00 2001
From: mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 4 Feb 2011 01:19:59 +0000
Subject: [PATCH] Clean up BaseSerialPortLib16550 to remove references and
 checks for Carrier Detect(CD).  This is not required for this library
 implementation.  The only signals used for Hardware Flow Control are RTS/CTS.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11300 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../BaseSerialPortLib16550/BaseSerialPortLib16550.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
index 17c60d379b..04d8ca1949 100644
--- a/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
+++ b/MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.c
@@ -1,7 +1,7 @@
 /** @file
   16550 UART Serial Port library functions
 
-  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -38,7 +38,6 @@
 #define   B_UART_LSR_TEMT     BIT6
 #define R_UART_MSR            6
 #define   B_UART_MSR_CTS      BIT4
-#define   B_UART_MSR_DCD      BIT7
 
 /**
   Read an 8-bit 16550 register.  If PcdSerialUseMmio is TRUE, then the value is read from 
@@ -194,9 +193,9 @@ SerialPortWrite (
   IN UINTN     NumberOfBytes
 )
 {
-  UINTN  Result;
-  UINTN  Index;
-  UINTN  FifoSize;
+  UINTN    Result;
+  UINTN    Index;
+  UINTN    FifoSize;
 
   if (Buffer == NULL) {
     return 0;
@@ -213,7 +212,7 @@ SerialPortWrite (
       FifoSize = 64;
     }
   }
-  
+
   Result = NumberOfBytes;
   while (NumberOfBytes != 0) {
     //
@@ -230,7 +229,7 @@ SerialPortWrite (
         //
         // Wait for notification from peer to send data
         //
-        while ((SerialPortReadRegister (R_UART_MSR) & (B_UART_MSR_CTS | B_UART_MSR_DCD)) == B_UART_MSR_DCD);
+        while ((SerialPortReadRegister (R_UART_MSR) & (B_UART_MSR_CTS)) == 0);
       }
       
       //