ArmPlatformPkg/NorFlashDxe: cue the variable driver with NvVarStoreFormatted

The BEFORE depex opcode that we currently use to force ourselves in front
of the variable driver cannot be combined with other depex opcodes.
Replace the depex with TRUE, and signal NvVarStoreFormattedLib through the
installation of "gEdkiiNvVarStoreFormattedGuid".

Platforms that rely on NorFlashDxe to format the variable store (as
opposed to formatting a variable store template through an FDF file, as
part of the build) should hook NvVarStoreFormattedLib into the variable
drivers they use, so that the latter await our cue.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Supreeth Venkatesh <Supreeth.Venkatesh@arm.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

2 files changed, 16 insertions, 4 deletions

diff --git a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashDxe.inf b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashDxe.inf
index 812dafd065..c40ac27a65 100644
--- a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashDxe.inf
+++ b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashDxe.inf
@@ -31,6 +31,7 @@
   MdePkg/MdePkg.dec

   MdeModulePkg/MdeModulePkg.dec

   ArmPlatformPkg/ArmPlatformPkg.dec

+  EmbeddedPkg/EmbeddedPkg.dec

 

 [LibraryClasses]

   IoLib

@@ -49,6 +50,7 @@
   gEfiVariableGuid

   gEfiAuthenticatedVariableGuid

   gEfiEventVirtualAddressChangeGuid

+  gEdkiiNvVarStoreFormattedGuid     ## PRODUCES ## PROTOCOL

 

 [Protocols]

   gEfiBlockIoProtocolGuid

@@ -67,7 +69,4 @@
   gArmPlatformTokenSpaceGuid.PcdNorFlashCheckBlockLocked

 

 [Depex]

-  #

-  # NorFlashDxe must be loaded before VariableRuntimeDxe in case empty flash needs populating with default values

-  #

-  BEFORE gVariableRuntimeDxeFileGuid

+  TRUE

diff --git a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c
index c3e6489f39..e62ffbb433 100644
--- a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c
+++ b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvbDxe.c
@@ -25,6 +25,7 @@
 

 #include <Guid/VariableFormat.h>

 #include <Guid/SystemNvDataGuid.h>

+#include <Guid/NvVarStoreFormatted.h>

 

 #include "NorFlashDxe.h"

 

@@ -777,6 +778,18 @@ NorFlashFvbInitialize (
   }

 

   //

+  // The driver implementing the variable read service can now be dispatched;

+  // the varstore headers are in place.

+  //

+  Status = gBS->InstallProtocolInterface (

+                  &gImageHandle,

+                  &gEdkiiNvVarStoreFormattedGuid,

+                  EFI_NATIVE_INTERFACE,

+                  NULL

+                  );

+  ASSERT_EFI_ERROR (Status);

+

+  //

   // Register for the virtual address change event

   //

   Status = gBS->CreateEventEx (