diff --git a/src/main/scala/rocketchip/Configs.scala b/src/main/scala/rocketchip/Configs.scala
index f69f0d9b..1c975c98 100644
--- a/src/main/scala/rocketchip/Configs.scala
+++ b/src/main/scala/rocketchip/Configs.scala
@@ -148,6 +148,10 @@ class WithDTS(model: String, compat: Seq[String]) extends Config((site, here, up
   case DTSCompat => compat
 })
 
+class WithTimebase(hertz: BigInt) extends Config((site, here, up) => {
+  case DTSTimebase => hertz
+})
+
 class WithScratchpad extends Config(new WithNMemoryChannels(0) ++ new WithDataScratchpad(16384))
 
 class DefaultFPGASmallConfig extends Config(new WithNSmallCores(1) ++ new DefaultFPGAConfig)