diff --git a/src/runtime/src/main.rs b/src/runtime/src/main.rs
index b83b2a4..d6c0fb1 100644
--- a/src/runtime/src/main.rs
+++ b/src/runtime/src/main.rs
@@ -22,6 +22,7 @@ use void::Void;
 use libconfig::Config;
 use libcortex_a9::l2c::enable_l2_cache;
 use libboard_artiq::{logger, identifier_read, init_gateware, pl};
+use embedded_hal::blocking::delay::DelayUs;
 
 const ASYNC_ERROR_COLLISION: u8 = 1 << 0;
 const ASYNC_ERROR_BUSY: u8 = 1 << 1;
@@ -108,6 +109,9 @@ pub fn main_core0() {
 
     info!("NAR3/Zynq7000 starting...");
 
+    init_gateware();
+    timer.delay_us(500); // wait for FCLK to switch and MMCM to lock
+
     ram::init_alloc_core0();
     gic::InterruptController::gic(mpcore::RegisterBlock::mpcore()).enable_interrupts();
 
@@ -141,9 +145,8 @@ pub fn main_core0() {
             Config::new_dummy()
         }
     };
-
+    
     rtio_clocking::init(&mut timer, &cfg);
-    init_gateware();
 
     task::spawn(report_async_rtio_errors());