diff --git a/src/main/scala/subsystem/Configs.scala b/src/main/scala/subsystem/Configs.scala
index 215ae26b0a6..353a77df2cd 100644
--- a/src/main/scala/subsystem/Configs.scala
+++ b/src/main/scala/subsystem/Configs.scala
@@ -514,6 +514,14 @@ class WithTimebase(hertz: BigInt) extends Config((site, here, up) => {
   case DTSTimebase => hertz
 })
 
+class WithRocketTileBootFreq(hertz: BigInt) extends Config((site, here, up) => {
+  case TilesLocated(InSubsystem) => up(TilesLocated(InSubsystem), site) map {
+    case tp: RocketTileAttachParams => tp.copy(tileParams = tp.tileParams.copy(
+      core = tp.tileParams.core.copy(bootFreqHz = hertz)))
+    case t => t
+  }
+})
+
 class WithDefaultMemPort extends Config((site, here, up) => {
   case ExtMem => Some(MemoryPortParams(MasterPortParams(
                       base = x"8000_0000",