Hi Rohit,

Please find my response inline marked [SAMI].

Regards,

Sami Mujawar

Invoke the constructor in the SEC phase to call into initialization
functions associated with libraries linked with this particular module.
For instance, PrePeiCore's CEntryPoint function calls DebugLib library's
print API before the library is initialized.  

This change is essential
to initialize uart for SEC phase.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
---
 ArmPlatformPkg/PrePeiCore/PrePeiCore.h | 11 ++++++++++-
 ArmPlatformPkg/PrePeiCore/PrePeiCore.c |  6 +++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

Changes since V1:
- Rebased on top of latest master branch.
- Addressed comments from Ard.

Changes since V2:
- Rebased on top of latest master branch.

Link to github branch for the patch -
https://github.com/rohit-arm/edk2/tree/sec_constructor_issue

diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
index 0345dd7bdd2a..b752c4b9e617 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
@@ -1,7 +1,7 @@
 /** @file
   Main file supporting the transition to PEI Core in Normal World for Versatile Express
 
-  Copyright (c) 2011, ARM Limited. All rights reserved.
+  Copyright (c) 2011 - 2022, ARM Limited. All rights reserved.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -73,4 +73,13 @@ PeiCommonExceptionEntry (
   IN UINTN   LR
   );
 
+/*
+ * Constructor for SEC phase

[SAMI] The above description does not appear to be correct.

Would the following test be more appropriate?

+ */
+VOID
+EFIAPI
+ProcessLibraryConstructorList (
+  VOID
+  );
+
 #endif
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.c b/ArmPlatformPkg/PrePeiCore/PrePeiCore.c
index 6dd9bcdea24f..9654866f0c13 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.c
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.c
@@ -1,7 +1,7 @@
 /** @file
   Main file supporting the transition to PEI Core in Normal World for Versatile Express
 
-  Copyright (c) 2011-2014, ARM Limited. All rights reserved.
+  Copyright (c) 2011 - 2022, ARM Limited. All rights reserved.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -86,6 +86,10 @@ CEntryPoint (
     ArmEnableVFP ();
   }
 
+  // Explicitly invoke the library constructor to resolve any library
+  // dependency.
+  ProcessLibraryConstructorList();

+
   // Note: The MMU will be enabled by MemoryPeim. Only the primary core will have the MMU on.
 
   // If not primary Jump to Secondary Main