Adding support for BeagleBoard.

ArmPkg - Supoprt for ARM specific things that can change as the architecture changes. Plus semihosting JTAG drivers.
EmbeddedPkg - Generic support for an embeddded platform. Including a light weight command line shell.
BeagleBoardPkg - Platform specifics for BeagleBoard. SD Card works, but USB has issues. Looks like a bug in the open source USB stack (Our internal stack works fine).


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9518 6f19259b-4bc3-4df7-8a09-765794883524

EmbeddedPkg/Library/SemiHostingSerialPortLib/SerialPortLib.c

@@ -0,0 +1,145 @@
+/** @file
+  Serial I/O Port library functions with no library constructor/destructor
+
+
+  Copyright (c) 2008-2009, Apple Inc. All rights reserved.
+  
+  All rights reserved. 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
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Uefi.h>
+#include <Library/DebugLib.h>
+#include <Library/SemihostLib.h>
+#include <Library/SerialPortLib.h>
+
+
+/*
+
+  Programmed hardware of Serial port.
+
+  @return    Always return EFI_UNSUPPORTED.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortInitialize (
+  VOID
+  )
+{
+  if (SemihostConnectionSupported ()) {
+    return RETURN_SUCCESS;
+  } else {
+    return RETURN_UNSUPPORTED;
+  }
+}
+
+/**
+  Write data to serial device.
+
+  @param  Buffer           Point of data buffer which need to be writed.
+  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
+
+  @retval 0                Write data failed.
+  @retval !0               Actual number of bytes writed to serial device.
+
+**/
+
+#define PRINT_BUFFER_SIZE       512
+#define PRINT_BUFFER_THRESHOLD  (PRINT_BUFFER_SIZE - 4)
+
+UINTN
+EFIAPI
+SerialPortWrite (
+  IN UINT8     *Buffer,
+  IN UINTN     NumberOfBytes
+)
+{
+  UINT8 PrintBuffer[PRINT_BUFFER_SIZE];
+  UINTN SourceIndex      = 0;
+  UINTN DestinationIndex = 0;
+  UINT8 CurrentCharacter;
+
+  while (SourceIndex < NumberOfBytes)
+  {
+      CurrentCharacter = Buffer[SourceIndex++];
+      
+      switch (CurrentCharacter)
+      {
+      case '\r':
+          continue;
+
+      case '\n':
+          PrintBuffer[DestinationIndex++] = ' ';
+          // fall through
+
+      default:
+          PrintBuffer[DestinationIndex++] = CurrentCharacter;
+          break;
+      }
+
+      if (DestinationIndex > PRINT_BUFFER_THRESHOLD)
+      {
+          PrintBuffer[DestinationIndex] = '\0';
+          SemihostWriteString ((CHAR8 *) PrintBuffer);
+
+          DestinationIndex = 0;
+      }
+  }
+  
+  if (DestinationIndex > 0)
+  {
+      PrintBuffer[DestinationIndex] = '\0';
+      SemihostWriteString ((CHAR8 *) PrintBuffer);
+  }
+
+  return 0;
+}
+
+
+/**
+  Read data from serial device and save the datas in buffer.
+
+  @param  Buffer           Point of data buffer which need to be writed.
+  @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
+
+  @retval 0                Read data failed.
+  @retval !0               Aactual number of bytes read from serial device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+  OUT UINT8     *Buffer,
+  IN  UINTN     NumberOfBytes
+)
+{
+  *Buffer = SemihostReadCharacter ();
+  return 1;
+}
+
+
+
+/**
+  Check to see if any data is avaiable to be read from the debug device.
+
+  @retval TRUE       At least one byte of data is avaiable to be read
+  @retval FALS     No data is avaiable to be read
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+  VOID
+  )
+{
+  // Since SemiHosting read character is blocking always say we have a char ready?
+  return SemihostConnectionSupported ();
+}
+