diff --git a/rocket/src/main/scala/arbiter.scala b/rocket/src/main/scala/arbiter.scala
index 78c3b47e..3ad0e750 100644
--- a/rocket/src/main/scala/arbiter.scala
+++ b/rocket/src/main/scala/arbiter.scala
@@ -10,7 +10,7 @@ class HellaCacheArbiter(n: Int)(implicit conf: RocketConfiguration) extends Modu
     val mem = new HellaCacheIO()(conf.dcache)
   }
 
-  val r_valid = io.requestor.map(r => RegUpdate(r.req.valid))
+  val r_valid = io.requestor.map(r => Reg(next=r.req.valid))
 
   io.mem.req.valid := io.requestor.map(_.req.valid).reduce(_||_)
   io.requestor(0).req.ready := io.mem.req.ready
diff --git a/rocket/src/main/scala/core.scala b/rocket/src/main/scala/core.scala
index f0872dcc..788e18dc 100644
--- a/rocket/src/main/scala/core.scala
+++ b/rocket/src/main/scala/core.scala
@@ -42,7 +42,7 @@ class Core(implicit conf: RocketConfiguration) extends Module
   } else null
 
   if (conf.vec) {
-    val vu = Module(new vu(RegUpdate(reset)))
+    val vu = Module(new vu(Reg(next=reset)))
 
     val vdtlb = Module(new TLB(8))
     ptw += vdtlb.io.ptw
diff --git a/rocket/src/main/scala/ctrl.scala b/rocket/src/main/scala/ctrl.scala
index 20b59d9b..6831b144 100644
--- a/rocket/src/main/scala/ctrl.scala
+++ b/rocket/src/main/scala/ctrl.scala
@@ -355,59 +355,59 @@ class Control(implicit conf: RocketConfiguration) extends Module
   val id_waddr  = Mux(id_sel_wa === WA_RA, RA, io.dpath.inst(31,27));
   val id_load_use = Bool();
   
-  val ex_reg_xcpt_interrupt  = RegReset(Bool(false))
-  val ex_reg_valid           = RegReset(Bool(false))
-  val ex_reg_eret            = RegReset(Bool(false))
-  val ex_reg_wen             = RegReset(Bool(false))
-  val ex_reg_fp_wen          = RegReset(Bool(false))
-  val ex_reg_flush_inst      = RegReset(Bool(false))
-  val ex_reg_jalr            = RegReset(Bool(false))
-  val ex_reg_btb_hit         = RegReset(Bool(false))
-  val ex_reg_div_mul_val     = RegReset(Bool(false))
-  val ex_reg_mem_val         = RegReset(Bool(false))
-  val ex_reg_xcpt            = RegReset(Bool(false))
-  val ex_reg_fp_val          = RegReset(Bool(false))
-  val ex_reg_vec_val         = RegReset(Bool(false))
-  val ex_reg_replay_next     = RegReset(Bool(false))
-  val ex_reg_load_use        = RegReset(Bool(false))
-  val ex_reg_pcr             = RegReset(PCR.N)
-  val ex_reg_br_type         = RegReset(BR_N)
+  val ex_reg_xcpt_interrupt  = Reg(init=Bool(false))
+  val ex_reg_valid           = Reg(init=Bool(false))
+  val ex_reg_eret            = Reg(init=Bool(false))
+  val ex_reg_wen             = Reg(init=Bool(false))
+  val ex_reg_fp_wen          = Reg(init=Bool(false))
+  val ex_reg_flush_inst      = Reg(init=Bool(false))
+  val ex_reg_jalr            = Reg(init=Bool(false))
+  val ex_reg_btb_hit         = Reg(init=Bool(false))
+  val ex_reg_div_mul_val     = Reg(init=Bool(false))
+  val ex_reg_mem_val         = Reg(init=Bool(false))
+  val ex_reg_xcpt            = Reg(init=Bool(false))
+  val ex_reg_fp_val          = Reg(init=Bool(false))
+  val ex_reg_vec_val         = Reg(init=Bool(false))
+  val ex_reg_replay_next     = Reg(init=Bool(false))
+  val ex_reg_load_use        = Reg(init=Bool(false))
+  val ex_reg_pcr             = Reg(init=PCR.N)
+  val ex_reg_br_type         = Reg(init=BR_N)
   val ex_reg_mem_cmd         = Reg(Bits())
   val ex_reg_mem_type        = Reg(Bits())
   val ex_reg_cause           = Reg(UInt())
 
-  val mem_reg_xcpt_interrupt  = RegReset(Bool(false))
-  val mem_reg_valid           = RegReset(Bool(false))
-  val mem_reg_eret            = RegReset(Bool(false))
-  val mem_reg_wen             = RegReset(Bool(false))
-  val mem_reg_fp_wen          = RegReset(Bool(false))
-  val mem_reg_flush_inst      = RegReset(Bool(false))
-  val mem_reg_div_mul_val     = RegReset(Bool(false))
-  val mem_reg_mem_val         = RegReset(Bool(false))
-  val mem_reg_xcpt            = RegReset(Bool(false))
-  val mem_reg_fp_val          = RegReset(Bool(false))
-  val mem_reg_vec_val         = RegReset(Bool(false))
-  val mem_reg_replay          = RegReset(Bool(false))
-  val mem_reg_replay_next     = RegReset(Bool(false))
-  val mem_reg_pcr             = RegReset(PCR.N)
+  val mem_reg_xcpt_interrupt  = Reg(init=Bool(false))
+  val mem_reg_valid           = Reg(init=Bool(false))
+  val mem_reg_eret            = Reg(init=Bool(false))
+  val mem_reg_wen             = Reg(init=Bool(false))
+  val mem_reg_fp_wen          = Reg(init=Bool(false))
+  val mem_reg_flush_inst      = Reg(init=Bool(false))
+  val mem_reg_div_mul_val     = Reg(init=Bool(false))
+  val mem_reg_mem_val         = Reg(init=Bool(false))
+  val mem_reg_xcpt            = Reg(init=Bool(false))
+  val mem_reg_fp_val          = Reg(init=Bool(false))
+  val mem_reg_vec_val         = Reg(init=Bool(false))
+  val mem_reg_replay          = Reg(init=Bool(false))
+  val mem_reg_replay_next     = Reg(init=Bool(false))
+  val mem_reg_pcr             = Reg(init=PCR.N)
   val mem_reg_cause           = Reg(UInt())
   val mem_reg_slow_bypass     = Reg(Bool())
 
-  val wb_reg_valid           = RegReset(Bool(false))
-  val wb_reg_pcr             = RegReset(PCR.N)
-  val wb_reg_wen             = RegReset(Bool(false))
-  val wb_reg_fp_wen          = RegReset(Bool(false))
-  val wb_reg_flush_inst      = RegReset(Bool(false))
-  val wb_reg_mem_val         = RegReset(Bool(false))
-  val wb_reg_eret            = RegReset(Bool(false))
-  val wb_reg_xcpt            = RegReset(Bool(false))
-  val wb_reg_replay          = RegReset(Bool(false))
+  val wb_reg_valid           = Reg(init=Bool(false))
+  val wb_reg_pcr             = Reg(init=PCR.N)
+  val wb_reg_wen             = Reg(init=Bool(false))
+  val wb_reg_fp_wen          = Reg(init=Bool(false))
+  val wb_reg_flush_inst      = Reg(init=Bool(false))
+  val wb_reg_mem_val         = Reg(init=Bool(false))
+  val wb_reg_eret            = Reg(init=Bool(false))
+  val wb_reg_xcpt            = Reg(init=Bool(false))
+  val wb_reg_replay          = Reg(init=Bool(false))
   val wb_reg_cause           = Reg(UInt())
-  val wb_reg_fp_val          = RegReset(Bool(false))
-  val wb_reg_div_mul_val     = RegReset(Bool(false))
+  val wb_reg_fp_val          = Reg(init=Bool(false))
+  val wb_reg_div_mul_val     = Reg(init=Bool(false))
 
   val take_pc = Bool()
-  val pc_taken = RegUpdate(take_pc, Bool(false))
+  val pc_taken = Reg(next=take_pc, init=Bool(false))
   val take_pc_wb = Bool()
   val ctrl_killd = Bool()
   val ctrl_killx = Bool()
@@ -611,17 +611,17 @@ class Control(implicit conf: RocketConfiguration) extends Module
 
   class Scoreboard(n: Int)
   {
-    val r = RegReset(Bits(0, n))
-    var next = r
+    val r = Reg(init=Bits(0, n))
+    var _next = r
     var ens = Bool(false)
     def apply(addr: UInt) = r(addr)
-    def set(en: Bool, addr: UInt): Unit = update(en, next | mask(en, addr))
-    def clear(en: Bool, addr: UInt): Unit = update(en, next & ~mask(en, addr))
+    def set(en: Bool, addr: UInt): Unit = update(en, _next | mask(en, addr))
+    def clear(en: Bool, addr: UInt): Unit = update(en, _next & ~mask(en, addr))
     private def mask(en: Bool, addr: UInt) = Mux(en, UInt(1) << addr, UInt(0))
     private def update(en: Bool, update: UInt) = {
-      next = update
+      _next = update
       ens = ens || en
-      when (ens) { r := next }
+      when (ens) { r := _next }
     }
   }
 
diff --git a/rocket/src/main/scala/ctrl_vec.scala b/rocket/src/main/scala/ctrl_vec.scala
index 85ef702b..2fa4c6f9 100644
--- a/rocket/src/main/scala/ctrl_vec.scala
+++ b/rocket/src/main/scala/ctrl_vec.scala
@@ -261,7 +261,7 @@ class rocketCtrlVec extends Module
 
   io.iface.exception := io.exception && io.sr_ev
 
-  val reg_hold = RegReset(Bool(false))
+  val reg_hold = Reg(init=Bool(false))
 
   when (valid_common && dec.io.sigs.xcpthold) { reg_hold := Bool(true) }
   when (io.eret) { reg_hold := Bool(false) }
diff --git a/rocket/src/main/scala/divider.scala b/rocket/src/main/scala/divider.scala
index 08e35766..6c6f0242 100644
--- a/rocket/src/main/scala/divider.scala
+++ b/rocket/src/main/scala/divider.scala
@@ -10,7 +10,7 @@ class MulDiv(mulUnroll: Int = 1, earlyOut: Boolean = false)(implicit conf: Rocke
   val mulw = (w+mulUnroll-1)/mulUnroll*mulUnroll
   
   val s_ready :: s_neg_inputs :: s_mul_busy :: s_div_busy :: s_move_rem :: s_neg_output :: s_done :: Nil = Enum(7) { UInt() };
-  val state = RegReset(s_ready)
+  val state = Reg(init=s_ready)
   
   val req = Reg(io.req.bits.clone)
   val count = Reg(UInt(width = log2Up(w+1)))
@@ -120,7 +120,7 @@ class Divider(earlyOut: Boolean = false)(implicit conf: RocketConfiguration) ext
   val w = io.req.bits.in1.getWidth
   
   val s_ready :: s_neg_inputs :: s_busy :: s_move_rem :: s_neg_output :: s_done :: Nil = Enum(6) { UInt() };
-  val state = RegReset(s_ready)
+  val state = Reg(init=s_ready)
   
   val count = Reg(UInt(width = log2Up(w+1)))
   val divby0 = Reg(Bool())
diff --git a/rocket/src/main/scala/dpath.scala b/rocket/src/main/scala/dpath.scala
index a22d0803..4e32be4c 100644
--- a/rocket/src/main/scala/dpath.scala
+++ b/rocket/src/main/scala/dpath.scala
@@ -50,7 +50,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Module
   val wb_reg_inst = Reg(Bits())
   val wb_reg_waddr = Reg(UInt())
   val wb_reg_wdata = Reg(Bits())
-  val wb_reg_ll_wb = RegReset(Bool(false))
+  val wb_reg_ll_wb = Reg(init=Bool(false))
   val wb_wdata = Bits()
   val wb_reg_store_data = Reg(Bits())
   val wb_reg_rs1 = Reg(Bits())
diff --git a/rocket/src/main/scala/dpath_util.scala b/rocket/src/main/scala/dpath_util.scala
index 7e193a35..40ae0e14 100644
--- a/rocket/src/main/scala/dpath_util.scala
+++ b/rocket/src/main/scala/dpath_util.scala
@@ -36,7 +36,7 @@ class rocketDpathBTB(entries: Int) extends Module
 
   for (i <- 0 until entries) {
     val tag = Reg(UInt())
-    val valid = RegReset(Bool(false))
+    val valid = Reg(init=Bool(false))
     hits(i) := valid && tag === io.current_pc
     updates(i) := valid && tag === io.correct_pc
 
@@ -145,19 +145,19 @@ class PCR(implicit conf: RocketConfiguration) extends Module
   val reg_count = WideCounter(32)
   val reg_compare = Reg(Bits(width = 32))
   val reg_cause = Reg(Bits(width = io.cause.getWidth))
-  val reg_tohost = RegReset(Bits(0, conf.xprlen))
-  val reg_fromhost = RegReset(Bits(0, conf.xprlen))
+  val reg_tohost = Reg(init=Bits(0, conf.xprlen))
+  val reg_fromhost = Reg(init=Bits(0, conf.xprlen))
   val reg_coreid = Reg(Bits(width = 16))
   val reg_k0 = Reg(Bits(width = conf.xprlen))
   val reg_k1 = Reg(Bits(width = conf.xprlen))
   val reg_ptbr = Reg(UInt(width = PADDR_BITS))
-  val reg_vecbank = RegReset(SInt(-1,8).toBits)
-  val reg_stats = RegReset(Bool(false))
-  val reg_error_mode = RegReset(Bool(false))
+  val reg_vecbank = Reg(init=SInt(-1,8).toBits)
+  val reg_stats = Reg(init=Bool(false))
+  val reg_error_mode = Reg(init=Bool(false))
   val reg_status = Reg(new Status) // reset down below
 
-  val r_irq_timer = RegReset(Bool(false))
-  val r_irq_ipi = RegReset(Bool(true))
+  val r_irq_timer = Reg(init=Bool(false))
+  val r_irq_ipi = Reg(init=Bool(true))
 
   val host_pcr_req_valid = Reg(Bool()) // don't reset
   val host_pcr_req_fire = host_pcr_req_valid && io.rw.cmd === PCR.N
diff --git a/rocket/src/main/scala/dpath_vec.scala b/rocket/src/main/scala/dpath_vec.scala
index 01449e53..a49cd2be 100644
--- a/rocket/src/main/scala/dpath_vec.scala
+++ b/rocket/src/main/scala/dpath_vec.scala
@@ -110,8 +110,8 @@ class rocketDpathVec extends Module
   val max_threads = UInt(WIDTH_BMASK)
   val uts_per_bank = Mux(Bool(HAVE_PVFB) & nreg_mod_bank > max_threads, max_threads, nreg_mod_bank)
 
-  val reg_hwvl = RegReset(UInt(32, 12))
-  val reg_appvl0 = RegReset(Bool(true))
+  val reg_hwvl = Reg(init=UInt(32, 12))
+  val reg_appvl0 = Reg(init=Bool(true))
   val hwvl_vcfg = (uts_per_bank * io.vecbankcnt)(11,0)
 
   val hwvl =
@@ -123,9 +123,9 @@ class rocketDpathVec extends Module
     Mux(io.wdata(11,0) < hwvl, io.wdata(11,0).toUInt,
         hwvl.toUInt))
 
-  val reg_nxregs = RegReset(UInt(32, 6))
-  val reg_nfregs = RegReset(UInt(32, 6))
-  val reg_appvl = RegReset(UInt(0, 12))
+  val reg_nxregs = Reg(init=UInt(32, 6))
+  val reg_nfregs = Reg(init=UInt(32, 6))
+  val reg_appvl = Reg(init=UInt(0, 12))
 
   when (io.valid)
   {
diff --git a/rocket/src/main/scala/fpu.scala b/rocket/src/main/scala/fpu.scala
index ac5f80e6..c6803a67 100644
--- a/rocket/src/main/scala/fpu.scala
+++ b/rocket/src/main/scala/fpu.scala
@@ -198,7 +198,7 @@ class FPToInt extends Module
   }
 
   val in = Reg(new Input)
-  val valid = RegUpdate(io.in.valid)
+  val valid = Reg(next=io.in.valid)
   when (io.in.valid) {
     def upconvert(x: UInt) = hardfloat.recodedFloatNToRecodedFloatM(x, Bits(0), 23, 9, 52, 12)._1
     when (io.in.bits.cmd === FCMD_STORE) {
@@ -381,7 +381,7 @@ class FPUSFMAPipe(val latency: Int) extends Module
   val one = Bits("h80000000")
   val zero = Cat(io.in1(32) ^ io.in2(32), Bits(0, 32))
 
-  val valid = RegUpdate(io.valid)
+  val valid = Reg(next=io.valid)
   when (io.valid) {
     cmd := Cat(io.cmd(1) & (cmd_fma || cmd_addsub), io.cmd(0))
     rm := io.rm
@@ -418,7 +418,7 @@ class FPUDFMAPipe(val latency: Int) extends Module
   val one = Bits("h8000000000000000")
   val zero = Cat(io.in1(64) ^ io.in2(64), Bits(0, 64))
 
-  val valid = RegUpdate(io.valid)
+  val valid = Reg(next=io.valid)
   when (io.valid) {
     cmd := Cat(io.cmd(1) & (cmd_fma || cmd_addsub), io.cmd(0))
     rm := io.rm
@@ -451,10 +451,10 @@ class FPU(sfma_latency: Int, dfma_latency: Int) extends Module
   when (io.ctrl.valid) {
     ex_reg_inst := io.dpath.inst
   }
-  val ex_reg_valid = Reg(updateData=io.ctrl.valid, resetData=Bool(false))
-  val mem_reg_valid = Reg(updateData=ex_reg_valid && !io.ctrl.killx, resetData=Bool(false))
+  val ex_reg_valid = Reg(next=io.ctrl.valid, init=Bool(false))
+  val mem_reg_valid = Reg(next=ex_reg_valid && !io.ctrl.killx, init=Bool(false))
   val killm = io.ctrl.killm || io.ctrl.nack_mem
-  val wb_reg_valid = Reg(updateData=mem_reg_valid && !killm, resetData=Bool(false))
+  val wb_reg_valid = Reg(next=mem_reg_valid && !killm, init=Bool(false))
 
   val fp_decoder = Module(new FPUDecoder)
   fp_decoder.io.inst := io.dpath.inst
@@ -464,7 +464,7 @@ class FPU(sfma_latency: Int, dfma_latency: Int) extends Module
   val wb_ctrl = RegEnable(mem_ctrl, mem_reg_valid)
 
   // load response
-  val load_wb = RegUpdate(io.dpath.dmem_resp_val)
+  val load_wb = Reg(next=io.dpath.dmem_resp_val)
   val load_wb_single = RegEnable(io.dpath.dmem_resp_type === MT_W || io.dpath.dmem_resp_type === MT_WU, io.dpath.dmem_resp_val)
   val load_wb_data = RegEnable(io.dpath.dmem_resp_data, io.dpath.dmem_resp_val)
   val load_wb_tag = RegEnable(io.dpath.dmem_resp_tag, io.dpath.dmem_resp_val)
@@ -546,7 +546,7 @@ class FPU(sfma_latency: Int, dfma_latency: Int) extends Module
   val maxLatency = pipes.map(_.lat).max
   val memLatencyMask = latencyMask(mem_ctrl, 2)
 
-  val wen = RegReset(Bits(0, maxLatency-1))
+  val wen = Reg(init=Bits(0, maxLatency-1))
   val winfo = Vec.fill(maxLatency-1){Reg(Bits())}
   val mem_wen = mem_reg_valid && (mem_ctrl.fma || mem_ctrl.fastpipe || mem_ctrl.fromint)
   val (write_port_busy, mem_winfo) = (Reg(Bool()), Reg(Bits()))
@@ -592,11 +592,11 @@ class FPU(sfma_latency: Int, dfma_latency: Int) extends Module
 
   val fp_inflight = wb_reg_valid && wb_ctrl.toint || wen.orR
   val fsr_busy = mem_ctrl.rdfsr && fp_inflight || wb_reg_valid && wb_ctrl.wrfsr
-  val units_busy = mem_reg_valid && mem_ctrl.fma && RegUpdate(Mux(ctrl.single, io.sfma.valid, io.dfma.valid))
+  val units_busy = mem_reg_valid && mem_ctrl.fma && Reg(next=Mux(ctrl.single, io.sfma.valid, io.dfma.valid))
   io.ctrl.nack_mem := fsr_busy || units_busy || write_port_busy
   io.ctrl.dec <> fp_decoder.io.sigs
   def useScoreboard(f: ((Pipe, Int)) => Bool) = pipes.zipWithIndex.filter(_._1.lat > 3).map(x => f(x)).fold(Bool(false))(_||_)
-  io.ctrl.sboard_set := wb_reg_valid && RegUpdate(useScoreboard(_._1.cond(mem_ctrl)))
+  io.ctrl.sboard_set := wb_reg_valid && Reg(next=useScoreboard(_._1.cond(mem_ctrl)))
   io.ctrl.sboard_clr := wen(0) && useScoreboard(x => wsrc === UInt(x._2))
   io.ctrl.sboard_clra := waddr
   // we don't currently support round-max-magnitude (rm=4)
diff --git a/rocket/src/main/scala/htif.scala b/rocket/src/main/scala/htif.scala
index eb4f536a..f327dddd 100644
--- a/rocket/src/main/scala/htif.scala
+++ b/rocket/src/main/scala/htif.scala
@@ -60,7 +60,7 @@ class RocketHTIF(w: Int)(implicit conf: TileLinkConfiguration) extends Module wi
   require(short_request_bits % w == 0)
 
   val rx_count_w = 13 + log2Up(64) - log2Up(w) // data size field is 12 bits
-  val rx_count = RegReset(UInt(0,rx_count_w))
+  val rx_count = Reg(init=UInt(0,rx_count_w))
   val rx_shifter = Reg(Bits(width = short_request_bits))
   val rx_shifter_in = Cat(io.host.in.bits, rx_shifter(short_request_bits-1,w))
   val next_cmd = rx_shifter_in(3,0)
@@ -100,7 +100,7 @@ class RocketHTIF(w: Int)(implicit conf: TileLinkConfiguration) extends Module wi
              Mux(cmd === cmd_readcr || cmd === cmd_writecr, size != UInt(1),
              Bool(true)))
 
-  val tx_count = RegReset(UInt(0, rx_count_w))
+  val tx_count = Reg(init=UInt(0, rx_count_w))
   val tx_subword_count = tx_count(log2Up(short_request_bits/w)-1,0)
   val tx_word_count = tx_count(rx_count_w-1, log2Up(short_request_bits/w))
   val packet_ram_raddr = tx_word_count(log2Up(packet_ram_depth)-1,0) - UInt(1)
@@ -112,7 +112,7 @@ class RocketHTIF(w: Int)(implicit conf: TileLinkConfiguration) extends Module wi
   val tx_size = Mux(!nack && (cmd === cmd_readmem || cmd === cmd_readcr || cmd === cmd_writecr), size, UInt(0))
   val tx_done = io.host.out.ready && tx_subword_count.andR && (tx_word_count === tx_size || tx_word_count > UInt(0) && packet_ram_raddr.andR)
 
-  val mem_acked = RegReset(Bool(false))
+  val mem_acked = Reg(init=Bool(false))
   val mem_gxid = Reg(Bits())
   val mem_gsrc = Reg(UInt(width = conf.ln.idBits))
   val mem_needs_ack = Reg(Bool())
@@ -125,7 +125,7 @@ class RocketHTIF(w: Int)(implicit conf: TileLinkConfiguration) extends Module wi
   io.mem.grant.ready := Bool(true)
 
   val state_rx :: state_pcr_req :: state_pcr_resp :: state_mem_req :: state_mem_wdata :: state_mem_wresp :: state_mem_rdata :: state_mem_finish :: state_tx :: Nil = Enum(9) { UInt() }
-  val state = RegReset(state_rx)
+  val state = Reg(init=state_rx)
 
   val rx_cmd = Mux(rx_word_count === UInt(0), next_cmd, cmd)
   when (state === state_rx && rx_done) {
@@ -134,7 +134,7 @@ class RocketHTIF(w: Int)(implicit conf: TileLinkConfiguration) extends Module wi
              state_tx))
   }
 
-  val mem_cnt = RegReset(UInt(0, log2Up(REFILL_CYCLES)))
+  val mem_cnt = Reg(init=UInt(0, log2Up(REFILL_CYCLES)))
   val x_init = Module(new Queue(new Acquire, 1))
   when (state === state_mem_req && x_init.io.enq.ready) {
     state := Mux(cmd === cmd_writemem, state_mem_wdata, state_mem_rdata)
@@ -198,8 +198,8 @@ class RocketHTIF(w: Int)(implicit conf: TileLinkConfiguration) extends Module wi
 
   val pcrReadData = Reg(Bits(width = io.cpu(0).pcr_rep.bits.getWidth))
   for (i <- 0 until nTiles) {
-    val my_reset = RegReset(Bool(true))
-    val my_ipi = RegReset(Bool(false))
+    val my_reset = Reg(init=Bool(true))
+    val my_ipi = Reg(init=Bool(false))
 
     val cpu = io.cpu(i)
     val me = pcr_coreid === UInt(i)
diff --git a/rocket/src/main/scala/icache.scala b/rocket/src/main/scala/icache.scala
index 262f3841..bae95113 100644
--- a/rocket/src/main/scala/icache.scala
+++ b/rocket/src/main/scala/icache.scala
@@ -61,10 +61,10 @@ class Frontend(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Modu
 
   val s1_pc = Reg(UInt())
   val s1_same_block = Reg(Bool())
-  val s2_valid = RegReset(Bool(true))
-  val s2_pc = RegReset(UInt(START_ADDR))
-  val s2_btb_hit = RegReset(Bool(false))
-  val s2_xcpt_if = RegReset(Bool(false))
+  val s2_valid = Reg(init=Bool(true))
+  val s2_pc = Reg(init=UInt(START_ADDR))
+  val s2_btb_hit = Reg(init=Bool(false))
+  val s2_xcpt_if = Reg(init=Bool(false))
 
   val btbTarget = Cat(btb.io.target(VADDR_BITS-1), btb.io.target)
   val pcp4_0 = s1_pc + UInt(c.ibytes)
@@ -144,16 +144,16 @@ class ICache(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Module
   }
 
   val s_ready :: s_request :: s_refill_wait :: s_refill :: Nil = Enum(4) { UInt() }
-  val state = RegReset(s_ready)
+  val state = Reg(init=s_ready)
   val invalidated = Reg(Bool())
   val stall = !io.resp.ready
   val rdy = Bool()
 
-  val s2_valid = RegReset(Bool(false))
+  val s2_valid = Reg(init=Bool(false))
   val s2_addr = Reg(UInt(width = PADDR_BITS))
   val s2_any_tag_hit = Bool()
 
-  val s1_valid = RegReset(Bool(false))
+  val s1_valid = Reg(init=Bool(false))
   val s1_pgoff = Reg(UInt(width = PGIDX_BITS))
   val s1_addr = Cat(io.req.bits.ppn, s1_pgoff).toUInt
   val s1_tag = s1_addr(c.tagbits+c.untagbits-1,c.untagbits)
@@ -195,7 +195,7 @@ class ICache(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Module
     tag_raddr := s0_pgoff(c.untagbits-1,c.offbits)
   }
 
-  val vb_array = RegReset(Bits(0, c.lines))
+  val vb_array = Reg(init=Bits(0, c.lines))
   when (refill_done && !invalidated) {
     vb_array := vb_array.bitSet(Cat(repl_way, s2_idx), Bool(true))
   }
diff --git a/rocket/src/main/scala/multiplier.scala b/rocket/src/main/scala/multiplier.scala
index 7d329de7..95d1218b 100644
--- a/rocket/src/main/scala/multiplier.scala
+++ b/rocket/src/main/scala/multiplier.scala
@@ -33,7 +33,7 @@ class Multiplier(unroll: Int = 1, earlyOut: Boolean = false)(implicit conf: Rock
   val w = (w0+1+unroll-1)/unroll*unroll
   val cycles = w/unroll
   
-  val r_val = RegReset(Bool(false))
+  val r_val = Reg(init=Bool(false))
   val r_prod = Reg(Bits(width = w*2))
   val r_lsb = Reg(Bits())
   val r_cnt = Reg(UInt(width = log2Up(cycles+1)))
diff --git a/rocket/src/main/scala/nbdcache.scala b/rocket/src/main/scala/nbdcache.scala
index 87c35d95..5e8b4c96 100644
--- a/rocket/src/main/scala/nbdcache.scala
+++ b/rocket/src/main/scala/nbdcache.scala
@@ -189,7 +189,7 @@ class MSHR(id: Int)(implicit conf: DCacheConfig, tl: TileLinkConfiguration) exte
   }
 
   val s_invalid :: s_wb_req :: s_wb_resp :: s_meta_clear :: s_refill_req :: s_refill_resp :: s_meta_write_req :: s_meta_write_resp :: s_drain_rpq :: Nil = Enum(9) { UInt() }
-  val state = RegReset(s_invalid)
+  val state = Reg(init=s_invalid)
 
   val acquire_type = Reg(UInt())
   val release_type = Reg(UInt())
@@ -280,7 +280,7 @@ class MSHR(id: Int)(implicit conf: DCacheConfig, tl: TileLinkConfiguration) exte
   io.req_pri_rdy := state === s_invalid
   io.req_sec_rdy := sec_rdy && rpq.io.enq.ready
 
-  val meta_hazard = RegReset(UInt(0,2))
+  val meta_hazard = Reg(init=UInt(0,2))
   when (meta_hazard != 0) { meta_hazard := meta_hazard + 1 }
   when (io.meta_write.fire()) { meta_hazard := 1 }
   io.probe_rdy := !idx_match || (state != s_wb_req && state != s_wb_resp && state != s_meta_clear && meta_hazard === 0)
@@ -338,7 +338,7 @@ class MSHRFile(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends M
     val fence_rdy = Bool(OUTPUT)
   }
 
-  val sdq_val = RegReset(Bits(0, conf.nsdq))
+  val sdq_val = Reg(init=Bits(0, conf.nsdq))
   val sdq_alloc_id = PriorityEncoder(~sdq_val(conf.nsdq-1,0))
   val sdq_rdy = !sdq_val.andR
   val sdq_enq = io.req.valid && io.req.ready && isWrite(io.req.bits.cmd)
@@ -432,9 +432,9 @@ class WritebackUnit(implicit conf: DCacheConfig, tl: TileLinkConfiguration) exte
     val release_data = Decoupled(new ReleaseData)
   }
 
-  val valid = RegReset(Bool(false))
-  val r1_data_req_fired = RegReset(Bool(false))
-  val r2_data_req_fired = RegReset(Bool(false))
+  val valid = Reg(init=Bool(false))
+  val r1_data_req_fired = Reg(init=Bool(false))
+  val r2_data_req_fired = Reg(init=Bool(false))
   val cmd_sent = Reg(Bool())
   val cnt = Reg(UInt(width = log2Up(REFILL_CYCLES+1)))
   val req = Reg(new WritebackReq)
@@ -506,7 +506,7 @@ class ProbeUnit(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
   }
 
   val s_reset :: s_invalid :: s_meta_read :: s_meta_resp :: s_mshr_req :: s_release :: s_writeback_req :: s_writeback_resp :: s_meta_write :: Nil = Enum(9) { UInt() }
-  val state = RegReset(s_invalid)
+  val state = Reg(init=s_invalid)
   val line_state = Reg(UInt())
   val way_en = Reg(Bits())
   val req = Reg(new InternalProbe)
@@ -575,7 +575,7 @@ class MetaDataArray(implicit conf: DCacheConfig, tl: TileLinkConfiguration) exte
     val resp = Vec.fill(conf.ways){(new MetaData).asOutput}
   }
 
-  val rst_cnt = RegReset(UInt(0, log2Up(conf.sets+1)))
+  val rst_cnt = Reg(init=UInt(0, log2Up(conf.sets+1)))
   val rst = rst_cnt < conf.sets
   when (rst) { rst_cnt := rst_cnt+1 }
 
@@ -743,19 +743,19 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
   val mshrs = Module(new MSHRFile)
 
   io.cpu.req.ready := Bool(true)
-  val s1_valid = Reg(updateData=io.cpu.req.fire(), resetData=Bool(false))
+  val s1_valid = Reg(next=io.cpu.req.fire(), init=Bool(false))
   val s1_req = Reg(io.cpu.req.bits.clone)
   val s1_valid_masked = s1_valid && !io.cpu.req.bits.kill
-  val s1_replay = RegReset(Bool(false))
+  val s1_replay = Reg(init=Bool(false))
   val s1_clk_en = Reg(Bool())
 
-  val s2_valid = Reg(updateData=s1_valid_masked, resetData=Bool(false))
+  val s2_valid = Reg(next=s1_valid_masked, init=Bool(false))
   val s2_req = Reg(io.cpu.req.bits.clone)
-  val s2_replay = Reg(updateData=s1_replay, resetData=Bool(false))
+  val s2_replay = Reg(next=s1_replay, init=Bool(false))
   val s2_recycle = Bool()
   val s2_valid_masked = Bool()
 
-  val s3_valid = RegReset(Bool(false))
+  val s3_valid = Reg(init=Bool(false))
   val s3_req = Reg(io.cpu.req.bits.clone)
   val s3_way = Reg(Bits())
 
@@ -865,7 +865,7 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
   val s2_hit = s2_tag_match && tl.co.isHit(s2_req.cmd, s2_hit_state) && s2_hit_state === tl.co.newStateOnHit(s2_req.cmd, s2_hit_state)
 
   // load-reserved/store-conditional
-  val lrsc_count = RegReset(UInt(0))
+  val lrsc_count = Reg(init=UInt(0))
   val lrsc_valid = lrsc_count.orR
   val lrsc_addr = Reg(UInt())
   val (s2_lr, s2_sc) = (s2_req.cmd === M_XLR, s2_req.cmd === M_XSC)
@@ -980,7 +980,7 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
   FIFOedLogicalNetworkIOWrapper(wb.io.release_data) <> io.mem.release.data
 
   // store->load bypassing
-  val s4_valid = Reg(updateData=s3_valid, resetData=Bool(false))
+  val s4_valid = Reg(next=s3_valid, init=Bool(false))
   val s4_req = RegEnable(s3_req, s3_valid && metaReadArb.io.out.valid)
   val bypasses = List(
     ((s2_valid_masked || s2_replay) && !s2_sc_fail, s2_req, amoalu.io.out),
@@ -1018,14 +1018,14 @@ class HellaCache(implicit conf: DCacheConfig, tl: TileLinkConfiguration) extends
   s2_valid_masked := s2_valid && !s2_nack
 
   val s2_recycle_ecc = (s2_valid || s2_replay) && s2_hit && s2_data_correctable
-  val s2_recycle_next = RegReset(Bool(false))
+  val s2_recycle_next = Reg(init=Bool(false))
   when (s1_valid || s1_replay) { s2_recycle_next := (s1_valid || s1_replay) && s2_recycle_ecc }
   s2_recycle := s2_recycle_ecc || s2_recycle_next
 
   // after a nack, block until nack condition resolves to save energy
-  val block_fence = RegReset(Bool(false))
+  val block_fence = Reg(init=Bool(false))
   block_fence := (s2_valid && s2_req.cmd === M_FENCE || block_fence) && !mshrs.io.fence_rdy
-  val block_miss = RegReset(Bool(false))
+  val block_miss = Reg(init=Bool(false))
   block_miss := (s2_valid || block_miss) && s2_nack_miss
   when (block_fence || block_miss) {
     io.cpu.req.ready := Bool(false)
diff --git a/rocket/src/main/scala/ptw.scala b/rocket/src/main/scala/ptw.scala
index 806ac261..3681586c 100644
--- a/rocket/src/main/scala/ptw.scala
+++ b/rocket/src/main/scala/ptw.scala
@@ -40,7 +40,7 @@ class PTW(n: Int)(implicit conf: RocketConfiguration) extends Module
   require(VPN_BITS == levels * bitsPerLevel)
 
   val s_ready :: s_req :: s_wait :: s_done :: s_error :: Nil = Enum(5) { UInt() };
-  val state = RegReset(s_ready)
+  val state = Reg(init=s_ready)
   val count = Reg(UInt(width = log2Up(levels)))
 
   val r_req_vpn = Reg(Bits())
diff --git a/rocket/src/main/scala/tlb.scala b/rocket/src/main/scala/tlb.scala
index 99997b39..1c3af620 100644
--- a/rocket/src/main/scala/tlb.scala
+++ b/rocket/src/main/scala/tlb.scala
@@ -22,7 +22,7 @@ class RocketCAM(entries: Int, tag_bits: Int) extends Module {
   val io = new CAMIO(entries, addr_bits, tag_bits);
   val cam_tags = Vec.fill(entries){Reg(Bits(width = tag_bits))}
 
-  val vb_array = RegReset(Bits(0, entries))
+  val vb_array = Reg(init=Bits(0, entries))
   when (io.write) {
     vb_array := vb_array.bitSet(io.write_addr, Bool(true));
     cam_tags(io.write_addr) := io.write_tag
@@ -94,7 +94,7 @@ class TLB(entries: Int) extends Module
   }
 
   val s_ready :: s_request :: s_wait :: s_wait_invalidate :: Nil = Enum(4) { UInt() }
-  val state = RegReset(s_ready)
+  val state = Reg(init=s_ready)
   val r_refill_tag = Reg(UInt())
   val r_refill_waddr = Reg(UInt())
 
diff --git a/rocket/src/main/scala/util.scala b/rocket/src/main/scala/util.scala
index b656d16e..ed008423 100644
--- a/rocket/src/main/scala/util.scala
+++ b/rocket/src/main/scala/util.scala
@@ -117,12 +117,12 @@ case class WideCounter(width: Int, inc: Bool = Bool(true))
 {
   private val isWide = width >= 4
   private val smallWidth = if (isWide) log2Up(width) else width
-  private val small = RegReset(UInt(0, smallWidth))
+  private val small = Reg(init=UInt(0, smallWidth))
   private val nextSmall = small + UInt(1, smallWidth+1)
   when (inc) { small := nextSmall(smallWidth-1,0) }
 
   private val large = if (isWide) {
-    val r = RegReset(UInt(0, width - smallWidth))
+    val r = Reg(init=UInt(0, width - smallWidth))
     when (inc && nextSmall(smallWidth)) { r := r + UInt(1) }
     r
   } else null