diff --git a/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.c b/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.c
index 011c2df0bf..583487c3bc 100644
--- a/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.c
+++ b/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.c
@@ -1265,6 +1265,11 @@ Returns:
   Status = gBS->SetTimer (UserInputDurationTime, TimerRelative, 20000000);
   ASSERT (Status == EFI_SUCCESS);
 
+  //
+  // invoke SMM handler to put eMMC/SD devices into ACPI mode for OS
+  //
+  IoWrite8(0xb2, 0xcd);
+
   //
   // To give the User a chance to enter Setup here, if user set TimeOut is 0.
   // BDS should still give user a chance to enter Setup
diff --git a/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.h b/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.h
index d447f77747..f9416e602a 100644
--- a/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.h
+++ b/CorebootModulePkg/Library/CorebootBdsLib/BdsPlatform.h
@@ -42,6 +42,7 @@ Abstract:
 #include <Library/UefiLib.h>
 #include <Library/DxeServicesTableLib.h>
 #include <Library/DevicePathLib.h>
+#include <Library/IoLib.h>
 
 #include <Protocol/PciIo.h>