diff --git a/Pixel3XL/Library/InMemorySerialPortLib/InMemorySerialPortLib.c b/Pixel3XL/Library/InMemorySerialPortLib/InMemorySerialPortLib.c
index b1c3b7a..542b1db 100644
--- a/Pixel3XL/Library/InMemorySerialPortLib/InMemorySerialPortLib.c
+++ b/Pixel3XL/Library/InMemorySerialPortLib/InMemorySerialPortLib.c
@@ -33,9 +33,23 @@ SerialPortInitialize (
   VOID
   )
 {
+  UINT8* base = (UINT8*)0xa1a10000ull;
+  for (UINTN i = 0; i < 0x200000; i++) {
+    base[i] = 0;
+  }
   return RETURN_SUCCESS;
 }
 
+static void mem_putchar(UINT8 c) {
+  static const UINTN size = 0x200000;
+  static UINTN offset = 0;
+  UINT8* base = (UINT8*)0xa1a10000ull;
+  base[offset++] = c;
+  if (offset >= size) {
+    offset = 0;
+  }
+}
+
 /**
   Write data from buffer to serial device.
 
@@ -60,7 +74,10 @@ SerialPortWrite (
   IN UINTN     NumberOfBytes
 )
 {
-  return 0;
+  for (UINTN i = 0; i < NumberOfBytes; i++) {
+    mem_putchar(Buffer[i]);
+  }
+  return NumberOfBytes;
 }
 
 
diff --git a/Pixel3XL/Pixel3XL.dsc b/Pixel3XL/Pixel3XL.dsc
index f8c5b2e..10fcc4f 100644
--- a/Pixel3XL/Pixel3XL.dsc
+++ b/Pixel3XL/Pixel3XL.dsc
@@ -43,7 +43,7 @@
   DxeServicesLib|MdePkg/Library/DxeServicesLib/DxeServicesLib.inf
   BootLogoLib|MdeModulePkg/Library/BootLogoLib/BootLogoLib.inf
 
-  SerialPortLib|MdePkg/Library/BaseSerialPortLibNull/BaseSerialPortLibNull.inf
+  SerialPortLib|Pixel3XL/Library/InMemorySerialPortLib/InMemorySerialPortLib.inf
   RealTimeClockLib|ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.inf
   TimeBaseLib|EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.inf