ArmPlatformPkg/NorFlashDxe: Optimise FVB protocol

- Only read what needs reading, don't read the whole block.
- Don't write back buffers containing no data after an erase.
- Reduce number of NOR erases when writing data. Only erase the block
  when required.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Harry Liebel <Harry.Liebel@arm.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15500 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashDxe.h

@@ -304,6 +304,13 @@ NorFlashWriteBlocks (
   IN  VOID              *Buffer
   );
 
+EFI_STATUS
+NorFlashWriteSingleWord (
+  IN NOR_FLASH_INSTANCE     *Instance,
+  IN UINTN                  WordAddress,
+  IN UINT32                 WriteData
+  );
+
 EFI_STATUS
 NorFlashReadBlocks (
   IN NOR_FLASH_INSTANCE   *Instance,
@@ -312,9 +319,24 @@ NorFlashReadBlocks (
   OUT VOID                *Buffer
   );
 
+EFI_STATUS
+NorFlashRead (
+  IN NOR_FLASH_INSTANCE   *Instance,
+  IN EFI_LBA              Lba,
+  IN UINTN                Offset,
+  IN UINTN                BufferSizeInBytes,
+  OUT VOID                *Buffer
+  );
+
 EFI_STATUS
 NorFlashReset (
   IN  NOR_FLASH_INSTANCE *Instance
   );
 
+EFI_STATUS
+NorFlashUnlockSingleBlockIfNecessary (
+  IN NOR_FLASH_INSTANCE     *Instance,
+  IN UINTN                  BlockAddress
+  );
+
 #endif /* __NOR_FLASH_DXE_H__ */