diff --git a/src/runtime/src/rtio_mgt.rs b/src/runtime/src/rtio_mgt.rs
index 6baff995..cdadf794 100644
--- a/src/runtime/src/rtio_mgt.rs
+++ b/src/runtime/src/rtio_mgt.rs
@@ -5,7 +5,7 @@ use libboard_zynq::{timer::GlobalTimer, time::Milliseconds};
 use embedded_hal::blocking::delay::DelayMs;
 use board_artiq::drtio_routing;
 use libcortex_a9::mutex::Mutex;
-use libasync::task;
+use libasync::{task, delay::delay};
 
 #[cfg(has_drtio)]
 pub mod drtio {
@@ -24,7 +24,7 @@ pub mod drtio {
         });
     }
 
-    fn link_rx_up(linkno: u8) -> bool {
+    async fn link_rx_up(linkno: u8) -> bool {
         let linkno = linkno as usize;
         unsafe {
             (csr::DRTIO[linkno].rx_up_read)() == 1
@@ -34,7 +34,7 @@ pub mod drtio {
     async fn recv_aux_timeout(linkno: u8, timeout: u32, timer: GlobalTimer) -> Result<drtioaux::Packet, &'static str> {
         let max_time = timer.get_time() + Milliseconds(timeout);
         loop {
-            if !link_rx_up(linkno) {
+            if !link_rx_up(linkno).await {
                 return Err("link went down");
             }
             if timer.get_time() > max_time {
@@ -257,7 +257,7 @@ pub mod drtio {
                 let linkno = linkno as u8;
                 if up_links[linkno as usize] {
                     /* link was previously up */
-                    if link_rx_up(linkno) {
+                    if link_rx_up(linkno).await {
                         process_unsolicited_aux(aux_mutex, linkno, timer).await;
                         process_local_errors(linkno).await;
                     } else {
@@ -266,7 +266,7 @@ pub mod drtio {
                     }
                 } else {
                     /* link was previously down */
-                    if link_rx_up(linkno) {
+                    if link_rx_up(linkno).await {
                         info!("[LINK#{}] link RX became up, pinging", linkno);
                         let ping_count = ping_remote(aux_mutex, linkno, timer).await;
                         if ping_count > 0 {
@@ -289,7 +289,8 @@ pub mod drtio {
                 }
             }
             destination_survey(aux_mutex, routing_table, &up_links, up_destinations, timer).await;
-            timer.delay_ms(200);
+            let mut countdown = timer.countdown();
+            delay(&mut countdown, Milliseconds(200)).await;
         }
     }
 
@@ -309,7 +310,7 @@ pub mod drtio {
         for linkno in 0..csr::DRTIO.len() {
             let linkno = linkno as u8;
             if link_rx_up(linkno) {
-                let reply = task::block_on(aux_transact(io, aux_mutex, linkno,
+                let reply = task::block_on(aux_transact(aux_mutex, linkno,
                     &drtioaux::Packet::ResetRequest, timer));
                 match reply {
                     Ok(drtioaux::Packet::ResetAck) => (),