[edk2-platforms][PATCH 3/3] Platform/RPi: Report core clock frequency during early init

["Pete Batard" <pete@akeo.ie>]

The previous commit ensures that gSerialLibCoreClockFreq contains the VPU
core frequency by the time we execute ArmPlatformGetVirtualMemoryMap ().

This value can prove useful for troubleshooting, so report it.

Signed-off-by: Pete Batard <pete@akeo.ie>
---
 Platform/RaspberryPi/Library/PlatformLib/RaspberryPiMem.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Platform/RaspberryPi/Library/PlatformLib/RaspberryPiMem.c b/Platform/RaspberryPi/Library/PlatformLib/RaspberryPiMem.c
index aae189ec8136..015d3dccc27c 100644
--- a/Platform/RaspberryPi/Library/PlatformLib/RaspberryPiMem.c
+++ b/Platform/RaspberryPi/Library/PlatformLib/RaspberryPiMem.c
@@ -22,7 +22,12 @@ extern UINT64 mSystemMemoryEnd;
 UINT64 mVideoCoreBase;
 UINT64 mVideoCoreSize;
 UINT32 mBoardRevision;
-
+//
+// gSerialLibCoreClockFreq, which resides in DualSerialLib is set
+// to the VPU Core Clock frequency by ArmPlatformPeiBootAction ().
+// We use it to report the core frequency during early boot.
+//
+extern UINT32 gSerialLibCoreClockFreq;
 
 // The total number of descriptors, including the final "end-of-table" descriptor.
 #define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS 11
@@ -66,6 +71,7 @@ ArmPlatformGetVirtualMemoryMap (
   DEBUG ((DEBUG_INFO, "Board Rev: 0x%lX\n", mBoardRevision));
   DEBUG ((DEBUG_INFO, "Base RAM : 0x%ll08X (Size 0x%ll08X)\n", mSystemMemoryBase, mSystemMemoryEnd + 1));
   DEBUG ((DEBUG_INFO, "VideoCore: 0x%ll08X (Size 0x%ll08X)\n", mVideoCoreBase, mVideoCoreSize));
+  DEBUG ((DEBUG_INFO, "Core Freq: %d MHz\n", gSerialLibCoreClockFreq / 1000000));
 
   ASSERT (mSystemMemoryBase == 0);
   ASSERT (VirtualMemoryMap != NULL);
-- 
2.21.0.windows.1