fix ps7_init compilation error and warnings

libboard_zynq/src/ddr/mod.rs

@@ -34,6 +34,7 @@ impl DdrRam {
             // We have not yet fixed red pitaya initialization yet.  It seems
             // that the clock configuration, iob settings and ddr settings are
             // all problematic
+            #[cfg(feature = "target_redpitaya")]
             ps7_init::apply();
             let regs = regs::RegisterBlock::ddrc();
             DdrRam { regs }

libboard_zynq/src/ps7_init/mod.rs

@@ -1,16 +1,19 @@
 
 use crate::println;
 
+#[cfg(feature = "target_zc706")]
 mod zc706;
+#[cfg(feature = "target_redpitaya")]
 mod redpitaya;
-// mod cora_z7_10;
+#[cfg(not(any(feature = "target_zc706", feature = "target_redpitaya")))]
+mod none;
 
 #[cfg(feature = "target_zc706")]
 use zc706 as target;
 #[cfg(feature = "target_redpitaya")]
 use redpitaya as target;
-// #[cfg(feature = "target_cora_z7_10")]
-// use cora_z7_10 as target;
+#[cfg(not(any(feature = "target_zc706", feature = "target_redpitaya")))]
+use none as target;
 
 pub fn report_differences() {
     for (i, op) in target::INIT_DATA.iter().enumerate() {

libboard_zynq/src/ps7_init/none.rs

@@ -0,0 +1,4 @@
+use super::InitOp::{self, *};
+
+pub const INIT_DATA: &'static [InitOp] = &[
+];