UefiPayloadPkg/PLatformHookLib: Set PcdSerialClockRate using HOB data

Fixes serial output on platforms using coreboot and a non-default clock rate such as AMD Picasso and newer. Signed-off-by: Matt DeVillier <[email protected]>
tianocore · Sep 19, 2024 · b6b5afe · b6b5afe
1 parent 9528582
commit b6b5afe
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diff --git a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
@@ -94,6 +94,13 @@ PlatformHookSerialPortInitialize (
       return Status;
     }
 
+    if (SerialPortInfo->Header.Revision >= 2) {
+      Status = PcdSet32S (PcdSerialClockRate, SerialPortInfo->ClockRate);
+      if (RETURN_ERROR (Status)) {
+        return Status;
+      }
+    }
+
     return RETURN_SUCCESS;
   }
 

diff --git a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
@@ -38,3 +38,4 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase    ## PRODUCES
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialBaudRate        ## PRODUCES
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterStride  ## PRODUCES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialClockRate       ## PRODUCES