From 20b1f1cbd0590aa71c6d99d35e23cf08e0707750 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Wed, 14 Oct 2015 13:49:43 +0200
Subject: ArmPlatformPkg: introduce fixed PCD for early hello message (RH only)

Drew has proposed that ARM|AARCH64 platform firmware (especially virtual
machine firmware) print a reasonably early, simple hello message to the
serial port, regardless of debug mask settings. This should inform
interactive users, and provide some rough help in localizing boot
problems, even with restrictive debug masks.

If a platform doesn't want this feature, it should stick with the default
empty string.

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1270279
Downstream only:
<http://thread.gmane.org/gmane.comp.bios.edk2.devel/2996/focus=3433>.

Notes about the 20160608b-988715a -> 20170228-c325e41585e3 rebase:

- no changes

Suggested-by: Drew Jones <drjones@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit 7ce97b06421434c82095f01a1753a8c9c546cc30)
---
 ArmPlatformPkg/ArmPlatformPkg.dec | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ArmPlatformPkg/ArmPlatformPkg.dec b/ArmPlatformPkg/ArmPlatformPkg.dec
index d756fd2..c265599 100644
--- a/ArmPlatformPkg/ArmPlatformPkg.dec
+++ b/ArmPlatformPkg/ArmPlatformPkg.dec
@@ -125,6 +125,13 @@
   gArmPlatformTokenSpaceGuid.PcdDefaultConInPaths|L""|VOID*|0x0000001B
   gArmPlatformTokenSpaceGuid.PcdDefaultConOutPaths|L""|VOID*|0x0000001C
 
+  #
+  # Early hello message (ASCII string), printed to the serial port.
+  # If set to the empty string, nothing is printed.
+  # Otherwise, a trailing CRLF should be specified explicitly.
+  #
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage|""|VOID*|0x00000100
+
 [PcdsFixedAtBuild.common,PcdsDynamic.common]
   ## PL031 RealTimeClock
   gArmPlatformTokenSpaceGuid.PcdPL031RtcBase|0x0|UINT32|0x00000024
-- 
1.8.3.1