1 files changed, 6 insertions, 0 deletions
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 104b2e79a5..2943e9e8af 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -41,6 +41,7 @@
   DEFINE TLS_ENABLE              = FALSE
   DEFINE TPM2_ENABLE             = FALSE
   DEFINE TPM2_CONFIG_ENABLE      = FALSE
+  DEFINE USE_LEGACY_ISA_STACK    = FALSE
 
   #
   # Flash size selection. Setting FD_SIZE_IN_KB on the command line directly to
@@ -759,11 +760,16 @@
   #
   # ISA Support
   #
+!if $(USE_LEGACY_ISA_STACK) == FALSE
   OvmfPkg/SioBusDxe/SioBusDxe.inf
+  MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxe.inf
+  MdeModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2KeyboardDxe.inf
+!else
   PcAtChipsetPkg/IsaAcpiDxe/IsaAcpi.inf
   IntelFrameworkModulePkg/Bus/Isa/IsaBusDxe/IsaBusDxe.inf
   IntelFrameworkModulePkg/Bus/Isa/IsaSerialDxe/IsaSerialDxe.inf
   IntelFrameworkModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2keyboardDxe.inf
+!endif
 
   #
   # SMBIOS Support