[PATCH] ArmPlatformPkg/PL011SerialPortLib: use untyped PCD for register base

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Use an untyped PCD reference for PcdSerialRegisterBase, so that the
library gets built without hardcoded values, permitting modules to
override the default serial port. This allows SerialDxe to use a
different serial port from the one used for DEBUG output (which
often gets occluded due to the console driver clearing the screen)

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c   | 14 +++++++-------
 ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.inf |  4 +++-
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c
index 212991d63859..d576f79c3e6e 100644
--- a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c
+++ b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c
@@ -48,7 +48,7 @@ SerialPortInitialize (
   StopBits = (EFI_STOP_BITS_TYPE) FixedPcdGet8 (PcdUartDefaultStopBits);
 
   return PL011UartInitializePort (
-           (UINTN)FixedPcdGet64 (PcdSerialRegisterBase),
+           (UINTN)PcdGet64 (PcdSerialRegisterBase),
            PL011UartClockGetFreq(),
            &BaudRate,
            &ReceiveFifoDepth,
@@ -75,7 +75,7 @@ SerialPortWrite (
   IN UINTN     NumberOfBytes
   )
 {
-  return PL011UartWrite ((UINTN)FixedPcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
+  return PL011UartWrite ((UINTN)PcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
 }
 
 /**
@@ -95,7 +95,7 @@ SerialPortRead (
   IN  UINTN     NumberOfBytes
 )
 {
-  return PL011UartRead ((UINTN)FixedPcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
+  return PL011UartRead ((UINTN)PcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
 }
 
 /**
@@ -111,7 +111,7 @@ SerialPortPoll (
   VOID
   )
 {
-  return PL011UartPoll ((UINTN)FixedPcdGet64 (PcdSerialRegisterBase));
+  return PL011UartPoll ((UINTN)PcdGet64 (PcdSerialRegisterBase));
 }
 /**
   Set new attributes to PL011.
@@ -156,7 +156,7 @@ SerialPortSetAttributes (
   )
 {
   return PL011UartInitializePort (
-           (UINTN)FixedPcdGet64 (PcdSerialRegisterBase),
+           (UINTN)PcdGet64 (PcdSerialRegisterBase),
            PL011UartClockGetFreq(),
            BaudRate,
            ReceiveFifoDepth,
@@ -198,7 +198,7 @@ SerialPortSetControl (
   IN UINT32  Control
   )
 {
-  return PL011UartSetControl ((UINTN)FixedPcdGet64 (PcdSerialRegisterBase), Control);
+  return PL011UartSetControl ((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
 }
 
 /**
@@ -239,5 +239,5 @@ SerialPortGetControl (
   OUT UINT32  *Control
   )
 {
-  return PL011UartGetControl ((UINTN)FixedPcdGet64 (PcdSerialRegisterBase), Control);
+  return PL011UartGetControl ((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
 }
diff --git a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.inf b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.inf
index 5ce5b2f5304c..bca7bed875c6 100644
--- a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.inf
+++ b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.inf
@@ -36,8 +36,10 @@
   MdeModulePkg/MdeModulePkg.dec
   ArmPlatformPkg/ArmPlatformPkg.dec
 
-[FixedPcd]
+[Pcd]
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase
+
+[FixedPcd]
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits
   gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity
-- 
2.17.1