src/gateware/kasli_soc.py

@@ -310,6 +310,7 @@ class GenericMaster(SoCCore):
             self.add_csr_group("grabber", self.grabber_csr_group)
         
 
+        self.rustc_cfg["has_virtual_leds"] = None
         self.submodules.virtual_leds = virtual_leds.VirtualLeds()
         self.csr_devices.append("virtual_leds")
 
@@ -482,6 +483,7 @@ class GenericSatellite(SoCCore):
             self.add_csr_group("grabber", self.grabber_csr_group)
             # no RTIO CRG here
         
+        self.rustc_cfg["has_virtual_leds"] = None
         self.submodules.virtual_leds = virtual_leds.VirtualLeds()
         self.csr_devices.append("virtual_leds")
 

src/libboard_artiq/src/io_expander.rs

@@ -152,6 +152,7 @@ impl IoExpander {
     }
 
     pub fn service(&mut self, i2c: &mut i2c::I2c) -> Result<(), &'static str> {
+        #[cfg(has_virtual_leds)]        
         for (led, port, bit) in self.virtual_led_mapping.iter() {
             let level = unsafe { csr::virtual_leds::status_read() >> led & 1 };
             self.set(*port, *bit, level != 0);