diff --git a/src/main/scala/radiance/tile/RadianceTile.scala b/src/main/scala/radiance/tile/RadianceTile.scala
index 18ed1d1..0dbc3bd 100644
--- a/src/main/scala/radiance/tile/RadianceTile.scala
+++ b/src/main/scala/radiance/tile/RadianceTile.scala
@@ -845,9 +845,8 @@ class RadianceTileModuleImp(outer: RadianceTile)
   // TODO: generalize for useVxCache
   if (!outer.radianceParams.useVxCache) {}
 
-  // connect io.start and io.finish of the fake TensorCoreDecoupled module to
-  // prevent optimize-out
-  outer.tensor.module.io.start := true.B
+  // connect io.start and io.finish of the fake TensorCoreDecoupled module
+  outer.tensor.module.io.start := false.B
 
   // // RoCC
   // if (outer.roccs.size > 0) {
diff --git a/src/main/scala/radiance/tile/VortexCore.scala b/src/main/scala/radiance/tile/VortexCore.scala
index ea0a16c..fccfb88 100644
--- a/src/main/scala/radiance/tile/VortexCore.scala
+++ b/src/main/scala/radiance/tile/VortexCore.scala
@@ -435,7 +435,7 @@ class Vortex(tile: RadianceTile)(implicit p: Parameters)
     addPath("/scratch/hansung/chipyard/sims/vcs/generated-src/chipyard.unittest.TestHarness.TensorUnitTestConfig/gen-collateral/TensorCoreDecoupled.sv")
     addPath("/scratch/hansung/chipyard/sims/vcs/generated-src/chipyard.unittest.TestHarness.TensorUnitTestConfig/gen-collateral/TensorDotProductUnit.sv")
   }
-  addHopperTensorCore
+  // addHopperTensorCore
   addResource("/vsrc/vortex/hw/rtl/core/VX_uop_sequencer.sv")
   addResource("/vsrc/vortex/hw/rtl/core/VX_reduce_unit.sv")
   addResource("/vsrc/vortex/hw/rtl/fpu/VX_tensor_dpu.sv")