diff --git a/artiq/firmware/libboard_artiq/hmc830_7043.rs b/artiq/firmware/libboard_artiq/hmc830_7043.rs
index c33131f54..e0ab1adc3 100644
--- a/artiq/firmware/libboard_artiq/hmc830_7043.rs
+++ b/artiq/firmware/libboard_artiq/hmc830_7043.rs
@@ -4,13 +4,15 @@ mod clock_mux {
     const CLK_SRC_EXT_SEL : u8 = 1 << 0;
     const REF_CLK_SRC_SEL : u8 = 1 << 1;
     const DAC_CLK_SRC_SEL : u8 = 1 << 2;
+    const REF_LO_CLK_SEL  : u8 = 1 << 3;
 
     pub fn init() {
         unsafe {
             csr::clock_mux::out_write(
                 1*CLK_SRC_EXT_SEL |  // use ext clk from sma
                 1*REF_CLK_SRC_SEL |
-                1*DAC_CLK_SRC_SEL);
+                1*DAC_CLK_SRC_SEL |
+                0*REF_LO_CLK_SEL);
         }
     }
 }
diff --git a/artiq/gateware/targets/sayma_rtm.py b/artiq/gateware/targets/sayma_rtm.py
index ac376f5d2..e3fca7e3e 100755
--- a/artiq/gateware/targets/sayma_rtm.py
+++ b/artiq/gateware/targets/sayma_rtm.py
@@ -124,7 +124,9 @@ class SaymaRTM(Module):
         self.submodules.clock_mux = gpio.GPIOOut(Cat(
             platform.request("clk_src_ext_sel"),
             platform.request("ref_clk_src_sel"),
-            platform.request("dac_clk_src_sel")))
+            platform.request("dac_clk_src_sel"),
+            platform.request("ref_lo_clk_sel")),
+            reset_out=0b0111)
         csr_devices.append("clock_mux")
 
         # UART loopback
diff --git a/conda/artiq-dev/meta.yaml b/conda/artiq-dev/meta.yaml
index 2243461ed..c19a7f3b0 100644
--- a/conda/artiq-dev/meta.yaml
+++ b/conda/artiq-dev/meta.yaml
@@ -14,7 +14,7 @@ requirements:
   run:
     - python >=3.5.3,<3.6
     - setuptools 33.1.1
-    - migen 0.7 py35_44+gitca28f4e
+    - migen 0.7 py35_46+git5947224c
     - misoc 0.11 py35_20+git2436a68d
     - jesd204b 0.7
     - microscope