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ArmPlatformPkg: Set Juno debug serial port defaults 

Juno has several serial ports, one of which may be used for a remote
debug interface (e.g. gdb, WinDbg).  The debug serial port needs to
be distinct from that used for UEFI trace to prevent corruption of
debugger protocol messaging.
The UEFI spec requires that serial devices be initialised to default
settings. (11.8 Serial I/O Protocol - "The default attributes for all
UART-style serial device interfaces are: 115,200 baud, ..."
and 17.3.3 EFI Debugport Variable - "These defaults must be used in the
absence of a DEBUGPORT variable...")

This change adds initialization of the serial device reported in the
ACPI DBG2 table.  The initialisation is done early in the boot to allow
the possibility of remote debug of UEFI itself.

NOTE: This is functionally dependent on the DBG2 table being updated in
OpenPlatformPkg, but is required as a precursor to that change.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Evan Lloyd 2016-06-20 19:43:04 +01:00 committed by Leif Lindholm
parent 80f7a8f5f9
commit 0312b14df6
3 changed files with 53 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
ArmPlatformPkg/ArmJunoPkg/Library/ArmJunoLib/ArmJuno.c
View File

@ -1,6 +1,6 @@
/** @file /** @file
* *
* Copyright (c) 2013-2014, ARM Limited. All rights reserved. * Copyright (c) 2013-2016, ARM Limited. All rights reserved.
* *
* This program and the accompanying materials * This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License * are licensed and made available under the terms and conditions of the BSD License
@ -12,6 +12,8 @@
* *
**/ **/
#include <Drivers/PL011Uart.h>
#include <Library/IoLib.h> #include <Library/IoLib.h>
#include <Library/ArmPlatformLib.h> #include <Library/ArmPlatformLib.h>
#include <Library/DebugLib.h> #include <Library/DebugLib.h>
@ -112,7 +114,37 @@ ArmPlatformInitialize (
IN UINTN MpId IN UINTN MpId
) )
{ {
return RETURN_SUCCESS; RETURN_STATUS Status;
UINT64 BaudRate;
UINT32 ReceiveFifoDepth;
EFI_PARITY_TYPE Parity;
UINT8 DataBits;
EFI_STOP_BITS_TYPE StopBits;
Status = RETURN_SUCCESS;
//
// Initialize the Serial Debug UART
//
if (FixedPcdGet64 (PcdSerialDbgRegisterBase)) {
ReceiveFifoDepth = 0; // Use the default value for FIFO depth
Parity = (EFI_PARITY_TYPE)FixedPcdGet8 (PcdUartDefaultParity);
DataBits = FixedPcdGet8 (PcdUartDefaultDataBits);
StopBits = (EFI_STOP_BITS_TYPE)FixedPcdGet8 (PcdUartDefaultStopBits);
BaudRate = (UINTN)FixedPcdGet64 (PcdSerialDbgUartBaudRate);
Status = PL011UartInitializePort (
(UINTN)FixedPcdGet64 (PcdSerialDbgRegisterBase),
FixedPcdGet32 (PcdSerialDbgUartClkInHz),
&BaudRate,
&ReceiveFifoDepth,
&Parity,
&DataBits,
&StopBits
);
}
return Status;
} }
/** /**

15
ArmPlatformPkg/ArmJunoPkg/Library/ArmJunoLib/ArmJunoLib.inf
View File

@ -1,5 +1,5 @@
# #
# Copyright (c) 2013-2015, ARM Limited. All rights reserved. # Copyright (c) 2013-2016, ARM Limited. All rights reserved.
# #
# This program and the accompanying materials # This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License # are licensed and made available under the terms and conditions of the BSD License
@ -57,6 +57,19 @@
gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceBaseAddress gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceBaseAddress
gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceSize gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceSize
#
# PL011 Serial Debug UART
#
gArmPlatformTokenSpaceGuid.PcdSerialDbgRegisterBase
gArmPlatformTokenSpaceGuid.PcdSerialDbgUartBaudRate
gArmPlatformTokenSpaceGuid.PcdSerialDbgUartClkInHz
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits
[Pcd] [Pcd]
gArmTokenSpaceGuid.PcdPciMmio32Base gArmTokenSpaceGuid.PcdPciMmio32Base
gArmTokenSpaceGuid.PcdPciMmio32Size gArmTokenSpaceGuid.PcdPciMmio32Size

5
ArmPlatformPkg/ArmPlatformPkg.dec
View File

@ -98,6 +98,11 @@
gArmPlatformTokenSpaceGuid.PL011UartFractional|0|UINT32|0x0000002D gArmPlatformTokenSpaceGuid.PL011UartFractional|0|UINT32|0x0000002D
gArmPlatformTokenSpaceGuid.PL011UartInterrupt|0x00000000|UINT32|0x0000002F gArmPlatformTokenSpaceGuid.PL011UartInterrupt|0x00000000|UINT32|0x0000002F
## PL011 Serial Debug UART
gArmPlatformTokenSpaceGuid.PcdSerialDbgRegisterBase|0x00000000|UINT64|0x00000030
gArmPlatformTokenSpaceGuid.PcdSerialDbgUartBaudRate|0x00000000|UINT64|0x00000031
gArmPlatformTokenSpaceGuid.PcdSerialDbgUartClkInHz|0x00000000|UINT32|0x00000032
## PL061 GPIO ## PL061 GPIO
gArmPlatformTokenSpaceGuid.PcdPL061GpioBase|0x0|UINT32|0x00000025 gArmPlatformTokenSpaceGuid.PcdPL061GpioBase|0x0|UINT32|0x00000025