diff --git a/artiq/firmware/runtime/rtio_mgt.rs b/artiq/firmware/runtime/rtio_mgt.rs
index 35083315c..ce89d18a2 100644
--- a/artiq/firmware/runtime/rtio_mgt.rs
+++ b/artiq/firmware/runtime/rtio_mgt.rs
@@ -251,6 +251,7 @@ pub fn startup(io: &Io) {
 pub fn init_core() {
     unsafe {
         csr::rtio_core::reset_write(1);
+        csr::rtio_core::reset_phy_write(1);
     }
     drtio::init()
 }