diff mbox series

[edk2,1/6] EmbeddedPkg/DtPlatformDxe: allow multiple entries in DTB FV file

Message ID 20170329134833.12956-2-ard.biesheuvel@linaro.org
State New
Headers show
Series Embedded|ArmPlatformPkg: spring cleaning + DtPlatformDxe switch | expand

Commit Message

Ard Biesheuvel March 29, 2017, 1:48 p.m. UTC 
To allow some dynamic behavior in selecting the DTB to expose to the
OS, allow the DTB FV file to contain multiple sections, and indirect
the choice of section via a fixed/dynamic PCD, which defaults to 0.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.c   | 5 ++++-
 EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.inf | 4 ++++
 EmbeddedPkg/EmbeddedPkg.dec                         | 3 +++
 3 files changed, 11 insertions(+), 1 deletion(-)

-- 
2.9.3

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diff mbox series

Patch

diff --git a/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.c b/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.c
index 5778633b4985..72f9f5721cda 100644
--- a/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.c
+++ b/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.c
@@ -17,6 +17,7 @@ 
 #include <Library/DevicePathLib.h>
 #include <Library/DxeServicesLib.h>
 #include <Library/HiiLib.h>
+#include <Library/PcdLib.h>
 #include <Library/MemoryAllocationLib.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/UefiDriverEntryPoint.h>
@@ -121,7 +122,9 @@  DtPlatformDxeEntryPoint (
   //
   Dtb = NULL;
   Status = GetSectionFromAnyFv (&gDtPlatformDefaultDtbFileGuid,
-             EFI_SECTION_RAW, 0, &Dtb, &DtbSize);
+             EFI_SECTION_RAW,
+             PcdGet8 (PcdDtPlatformDefaultDtbSectionIndex),
+             &Dtb, &DtbSize);
   if (EFI_ERROR (Status)) {
     DEBUG ((DEBUG_WARN, "%a: no DTB blob found, defaulting to ACPI\n",
       __FUNCTION__));
diff --git a/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.inf b/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.inf
index b73877a6086b..c16202790ed9 100644
--- a/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.inf
+++ b/EmbeddedPkg/Drivers/DtPlatformDxe/DtPlatformDxe.inf
@@ -43,6 +43,7 @@  [LibraryClasses]
   DxeServicesLib
   HiiLib
   MemoryAllocationLib
+  PcdLib
   UefiBootServicesTableLib
   UefiDriverEntryPoint
   UefiRuntimeServicesTableLib
@@ -56,3 +57,6 @@  [Guids]
 [Depex]
   gEfiVariableArchProtocolGuid        AND
   gEfiVariableWriteArchProtocolGuid
+
+[Pcd]
+  gEmbeddedTokenSpaceGuid.PcdDtPlatformDefaultDtbSectionIndex
diff --git a/EmbeddedPkg/EmbeddedPkg.dec b/EmbeddedPkg/EmbeddedPkg.dec
index 871fc5ff4016..f1b7af347861 100644
--- a/EmbeddedPkg/EmbeddedPkg.dec
+++ b/EmbeddedPkg/EmbeddedPkg.dec
@@ -198,3 +198,6 @@  [PcdsFixedAtBuild.X64]
 
 [PcdsFixedAtBuild.common, PcdsDynamic.common]
   gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths|L""|VOID*|0x00000055
+
+  # the section containing the default DTB for the current platform
+  gEmbeddedTokenSpaceGuid.PcdDtPlatformDefaultDtbSectionIndex|0|UINT8|0x00000057