diff --git a/src/runtime/src/si5324.rs b/src/runtime/src/si5324.rs
index dbd301d..f981c00 100644
--- a/src/runtime/src/si5324.rs
+++ b/src/runtime/src/si5324.rs
@@ -270,76 +270,4 @@ pub fn select_input(i2c: &mut I2c, input: Input, timer: GlobalTimer) -> Result<(
     }
     monitor_lock(i2c, timer)?;
     Ok(())
-}
-
-#[cfg(has_siphaser)]
-pub mod siphaser {
-    use super::*;
-    use pl::csr;
-
-    pub fn select_recovered_clock(i2c: &mut I2c, rc: bool, timer: GlobalTimer) -> Result<()> {
-        write(i2c, 3,   (read(3)? & 0xdf) | (1 << 5))?;  // DHOLD=1
-        unsafe {
-            csr::siphaser::switch_clocks_write(if rc { 1 } else { 0 });
-        }
-        write(i2c, 3,   (read(3)? & 0xdf) | (0 << 5))?;  // DHOLD=0
-        monitor_lock(timer)?;
-        Ok(())
-    }
-
-    fn phase_shift(direction: u8, timer: GlobalTimer) {
-        unsafe {
-            csr::siphaser::phase_shift_write(direction);
-            while csr::siphaser::phase_shift_done_read() == 0 {}
-        }
-        // wait for the Si5324 loop to stabilize
-        timer.delay_us(500);
-    }
-
-    fn has_error(timer: GlobalTimer) -> bool {
-        unsafe {
-            csr::siphaser::error_write(1);
-        }
-        timer.delay_us(5_000);
-        unsafe {
-            csr::siphaser::error_read() != 0
-        }
-    }
-
-    fn find_edge(target: bool, timer: GlobalTimer) -> Result<u32> {
-        let mut nshifts = 0;
-
-        let mut previous = has_error(timer);
-        loop {
-            phase_shift(1, timer);
-            nshifts += 1;
-            let current = has_error(timer);
-            if previous != target && current == target {
-                return Ok(nshifts);
-            }
-            if nshifts > 5000 {
-                return Err("failed to find timing error edge");
-            }
-            previous = current;
-        }
-    }
-
-    pub fn calibrate_skew(timer: GlobalTimer) -> Result<()> {
-        let jitter_margin = 32;
-        let lead = find_edge(false, timer)?;
-        for _ in 0..jitter_margin {
-            phase_shift(1, timer);
-        }
-        let width = find_edge(true, timer)? + jitter_margin;
-        // width is 360 degrees (one full rotation of the phase between s/h limits) minus jitter
-        info!("calibration successful, lead: {}, width: {} ({}deg)", lead, width, width*360/(56*8));
-
-        // Apply reverse phase shift for half the width to get into the
-        // middle of the working region.
-        for _ in 0..width/2 {
-            phase_shift(0, timer);
-        }
-
-        Ok(())
-    }
-}
+}
\ No newline at end of file