diff --git a/Platform/Socionext/DeveloperBox/DeveloperBox.dsc b/Platform/Socionext/DeveloperBox/DeveloperBox.dsc
index b558b1f805b4..91898faa6ecc 100644
--- a/Platform/Socionext/DeveloperBox/DeveloperBox.dsc
+++ b/Platform/Socionext/DeveloperBox/DeveloperBox.dsc
@@ -446,8 +446,7 @@ [Components.common]
   MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounterRuntimeDxe.inf
   EmbeddedPkg/RealTimeClockRuntimeDxe/RealTimeClockRuntimeDxe.inf {
     <LibraryClasses>
-      ## TODO
-      RealTimeClockLib|EmbeddedPkg/Library/TemplateRealTimeClockLib/TemplateRealTimeClockLib.inf
+      RealTimeClockLib|Silicon/NXP/Library/Pcf8563RealTimeClockLib/Pcf8563RealTimeClockLib.inf
   }
   MdeModulePkg/Universal/ResetSystemRuntimeDxe/ResetSystemRuntimeDxe.inf
   MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
@@ -627,6 +626,11 @@ [Components.common]
 
   Platform/Socionext/DeveloperBox/OsInstallerMenuDxe/OsInstallerMenuDxe.inf
 
+  #
+  # I2C
+  #
+  Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.inf
+
 !if $(DO_X86EMU) == TRUE
   #
   # x86 emulator
diff --git a/Platform/Socionext/DeveloperBox/DeveloperBox.fdf b/Platform/Socionext/DeveloperBox/DeveloperBox.fdf
index 19dbcf17c1e1..368bf801e036 100644
--- a/Platform/Socionext/DeveloperBox/DeveloperBox.fdf
+++ b/Platform/Socionext/DeveloperBox/DeveloperBox.fdf
@@ -236,6 +236,11 @@ [FV.FvMain]
 
   INF Platform/Socionext/DeveloperBox/OsInstallerMenuDxe/OsInstallerMenuDxe.inf
 
+  #
+  # I2C
+  #
+  INF Silicon/Socionext/SynQuacer/Drivers/SynQuacerI2cDxe/SynQuacerI2cDxe.inf
+
 !if $(DO_X86EMU) == TRUE
   #
   # x86 emulator
diff --git a/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.c b/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.c
index 1d300b15e25b..b39cbc5f5291 100644
--- a/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.c
+++ b/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.c
@@ -62,27 +62,61 @@ STATIC EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR mNetsecDesc[] = {
   }
 };
 
+STATIC EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR mI2c0Desc[] = {
+  {
+    ACPI_ADDRESS_SPACE_DESCRIPTOR,                    // Desc
+    sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) - 3,   // Len
+    ACPI_ADDRESS_SPACE_TYPE_MEM,                      // ResType
+    0,                                                // GenFlag
+    0,                                                // SpecificFlag
+    32,                                               // AddrSpaceGranularity
+    SYNQUACER_I2C0_BASE,                              // AddrRangeMin
+    SYNQUACER_I2C0_BASE + SYNQUACER_I2C0_SIZE - 1,    // AddrRangeMax
+    0,                                                // AddrTranslationOffset
+    SYNQUACER_I2C0_SIZE,                              // AddrLen
+  }, {
+    ACPI_END_TAG_DESCRIPTOR                           // Desc
+  }
+};
+
+STATIC EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR mI2c1Desc[] = {
+  {
+    ACPI_ADDRESS_SPACE_DESCRIPTOR,                    // Desc
+    sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) - 3,   // Len
+    ACPI_ADDRESS_SPACE_TYPE_MEM,                      // ResType
+    0,                                                // GenFlag
+    0,                                                // SpecificFlag
+    32,                                               // AddrSpaceGranularity
+    SYNQUACER_I2C1_BASE,                              // AddrRangeMin
+    SYNQUACER_I2C1_BASE + SYNQUACER_I2C1_SIZE - 1,    // AddrRangeMax
+    0,                                                // AddrTranslationOffset
+    SYNQUACER_I2C1_SIZE,                              // AddrLen
+  }, {
+    ACPI_END_TAG_DESCRIPTOR                           // Desc
+  }
+};
+
 STATIC
 EFI_STATUS
-RegisterNetsec (
-  VOID
+RegisterDevice (
+  IN  EFI_GUID                            *TypeGuid,
+  IN  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR   *Desc,
+  OUT EFI_HANDLE                          *Handle
   )
 {
   NON_DISCOVERABLE_DEVICE             *Device;
   EFI_STATUS                          Status;
-  EFI_HANDLE                          Handle;
 
   Device = (NON_DISCOVERABLE_DEVICE *)AllocateZeroPool (sizeof (*Device));
   if (Device == NULL) {
     return EFI_OUT_OF_RESOURCES;
   }
 
-  Device->Type = &gNetsecNonDiscoverableDeviceGuid;
+  Device->Type = TypeGuid;
   Device->DmaType = NonDiscoverableDeviceDmaTypeNonCoherent;
-  Device->Resources = mNetsecDesc;
+  Device->Resources = Desc;
 
-  Handle = NULL;
-  Status = gBS->InstallMultipleProtocolInterfaces (&Handle,
+  Status = gBS->InstallMultipleProtocolInterfaces (Handle,
                   &gEdkiiNonDiscoverableDeviceProtocolGuid, Device,
                   NULL);
   if (EFI_ERROR (Status)) {
@@ -106,6 +140,7 @@ PlatformDxeEntryPoint (
   EFI_STATUS                      Status;
   VOID                            *Dtb;
   UINTN                           DtbSize;
+  EFI_HANDLE                      Handle;
 
   Dtb = NULL;
   Status = DtPlatformLoadDtb (&Dtb, &DtbSize);
@@ -118,5 +153,30 @@ PlatformDxeEntryPoint (
       Status));
   }
 
-  return RegisterNetsec ();
+  Handle = NULL;
+  Status = RegisterDevice (&gNetsecNonDiscoverableDeviceGuid, mNetsecDesc,
+             &Handle);
+  ASSERT_EFI_ERROR (Status);
+
+  Handle = NULL;
+  Status = RegisterDevice (&gSynQuacerNonDiscoverableRuntimeI2cMasterGuid,
+             mI2c0Desc, &Handle);
+  ASSERT_EFI_ERROR (Status);
+
+  //
+  // Install the PCF8563 I2C Master protocol on this handle so the RTC driver
+  // can identify it as the I2C master it can invoke directly, rather than
+  // through the I2C driver stack (which cannot be used at runtime)
+  //
+  Status = gBS->InstallProtocolInterface (&Handle,
+                  &gPcf8563RealTimeClockLibI2cMasterProtolGuid,
+                  EFI_NATIVE_INTERFACE, NULL);
+  ASSERT_EFI_ERROR (Status);
+
+  Handle = NULL;
+  Status = RegisterDevice (&gSynQuacerNonDiscoverableI2cMasterGuid, mI2c1Desc,
+             &Handle);
+  ASSERT_EFI_ERROR (Status);
+
+  return EFI_SUCCESS;
 }
diff --git a/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.inf b/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.inf
index 25e6248f1c61..478e0c7d33e9 100644
--- a/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.inf
+++ b/Silicon/Socionext/SynQuacer/Drivers/PlatformDxe/PlatformDxe.inf
@@ -29,6 +29,7 @@ [Packages]
   EmbeddedPkg/EmbeddedPkg.dec
   MdeModulePkg/MdeModulePkg.dec
   MdePkg/MdePkg.dec
+  Silicon/NXP/Library/Pcf8563RealTimeClockLib/Pcf8563RealTimeClockLib.dec
   Silicon/Socionext/SynQuacer/Drivers/Net/NetsecDxe/NetsecDxe.dec
   Silicon/Socionext/SynQuacer/SynQuacer.dec
 
@@ -43,9 +44,12 @@ [LibraryClasses]
 [Guids]
   gFdtTableGuid
   gNetsecNonDiscoverableDeviceGuid
+  gSynQuacerNonDiscoverableI2cMasterGuid
+  gSynQuacerNonDiscoverableRuntimeI2cMasterGuid
 
 [Protocols]
-  gEdkiiNonDiscoverableDeviceProtocolGuid     ## PRODUCES
+  gEdkiiNonDiscoverableDeviceProtocolGuid         ## PRODUCES
+  gPcf8563RealTimeClockLibI2cMasterProtolGuid     ## PRODUCES
 
 [FixedPcd]
   gSynQuacerTokenSpaceGuid.PcdNetsecEepromBase
diff --git a/Silicon/Socionext/SynQuacer/Include/Platform/MemoryMap.h b/Silicon/Socionext/SynQuacer/Include/Platform/MemoryMap.h
index 1ccd3122cdda..49795f97602c 100644
--- a/Silicon/Socionext/SynQuacer/Include/Platform/MemoryMap.h
+++ b/Silicon/Socionext/SynQuacer/Include/Platform/MemoryMap.h
@@ -42,6 +42,14 @@
 #define SYNQUACER_GPIO_BASE             0x51000000
 #define SYNQUACER_GPIO_SIZE             SIZE_4KB
 
+// I2C0 block
+#define SYNQUACER_I2C0_BASE             0x51200000
+#define SYNQUACER_I2C0_SIZE             SIZE_4KB
+
+// I2C1 block
+#define SYNQUACER_I2C1_BASE             0x51210000
+#define SYNQUACER_I2C1_SIZE             SIZE_4KB
+
 // eMMC(SDH30)
 #define SYNQUACER_EMMC_BASE             0x52300000
 #define SYNQUACER_EMMC_BASE_SZ          SIZE_4KB
diff --git a/Silicon/Socionext/SynQuacer/Library/SynQuacerMemoryInitPeiLib/SynQuacerMemoryInitPeiLib.c b/Silicon/Socionext/SynQuacer/Library/SynQuacerMemoryInitPeiLib/SynQuacerMemoryInitPeiLib.c
index be9e28d2ff49..c8c940f27917 100644
--- a/Silicon/Socionext/SynQuacer/Library/SynQuacerMemoryInitPeiLib/SynQuacerMemoryInitPeiLib.c
+++ b/Silicon/Socionext/SynQuacer/Library/SynQuacerMemoryInitPeiLib/SynQuacerMemoryInitPeiLib.c
@@ -82,6 +82,10 @@ STATIC CONST ARM_MEMORY_REGION_DESCRIPTOR mVirtualMemoryTable[] = {
   ARM_DEVICE_REGION (FixedPcdGet32 (PcdNetsecEepromBase),
                      SYNQUACER_EEPROM_BASE_SZ),
 
+  // SynQuacer I2C
+  ARM_DEVICE_REGION (SYNQUACER_I2C0_BASE, SYNQUACER_I2C0_SIZE),
+  ARM_DEVICE_REGION (SYNQUACER_I2C1_BASE, SYNQUACER_I2C1_SIZE),
+
   // SynQuacer NETSEC
   ARM_DEVICE_REGION (SYNQUACER_NETSEC_BASE, SYNQUACER_NETSEC_BASE_SZ),
 
