diff --git a/fpga/src/main/scala/arty100t/Configs.scala b/fpga/src/main/scala/arty100t/Configs.scala
index d5c83af3..03ab2b1e 100644
--- a/fpga/src/main/scala/arty100t/Configs.scala
+++ b/fpga/src/main/scala/arty100t/Configs.scala
@@ -46,6 +46,7 @@ class WithArty100TTweaks(freqMHz: Double = 50) extends Config(
 
 class RocketArty100TConfig extends Config(
   new WithArty100TTweaks ++
+  new testchipip.soc.WithMbusScratchpad(base = 0x08000000, size = 128 * 1024) ++ // use rocket l1 DCache scratchpad as base phys mem
   new chipyard.config.WithBroadcastManager ++ // no l2
   new chipyard.RocketConfig)