diff --git a/.cargo/config b/.cargo/config
index 2b26448..578d12a 100644
--- a/.cargo/config
+++ b/.cargo/config
@@ -1,9 +1,9 @@
-[target.armv7-none-eabihf]
+[target.armv7a-none-eabihf]
 rustflags = [
   "-C", "link-arg=-Tlink.x",
-  "-C", "target-feature=a9,armv7-a,neon",
+  "-C", "target-feature=+neon",
   "-C", "target-cpu=cortex-a9",
 ]
 
 [build]
-target = "armv7-none-eabihf.json"
+target = "armv7a-none-eabihf.json"
diff --git a/Cargo.lock b/Cargo.lock
index 8aac19a..57434f6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -41,7 +41,7 @@ checksum = "13e81c6cd7ab79f51a0c927d22858d61ad12bd0b3865f0b13ece02a4486aeabb"
 [[package]]
 name = "core_io"
 version = "0.1.20221029"
-source = "git+https://github.com/thomasfire/rust-core_io.git#cdaefa2b56c0782364a76945bb3664663fdcfe52"
+source = "git+https://github.com/thomasfire/rust-core_io.git#b33eedf99f3c4b417e354aa370858332a00e24e9"
 dependencies = [
  "rustc_version",
 ]
diff --git a/README.md b/README.md
index 7a84936..6df3eff 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ nix develop
 cargo xbuild --release -p experiments
 ```
 
-Currently the ELF output is placed at `target/armv7-none-eabi/release/experiments`, or `result/experiments.elf` for Nix Flakes build.
+Currently the ELF output is placed at `target/armv7a-none-eabi/release/experiments`, or `result/experiments.elf` for Nix Flakes build.
 
 ## Debug
 
diff --git a/armv7-none-eabihf.json b/armv7a-none-eabihf.json
similarity index 82%
rename from armv7-none-eabihf.json
rename to armv7a-none-eabihf.json
index 4fc452f..6062f98 100644
--- a/armv7-none-eabihf.json
+++ b/armv7a-none-eabihf.json
@@ -1,12 +1,4 @@
 {
-  "abi-blacklist": [
-    "stdcall",
-    "fastcall",
-    "vectorcall",
-    "thiscall",
-    "win64",
-    "sysv64"
-  ],
   "arch": "arm",
   "data-layout": "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64",
   "emit-debug-gdb-scripts": false,
diff --git a/experiments/src/main.rs b/experiments/src/main.rs
index 59cec7f..f7650d8 100644
--- a/experiments/src/main.rs
+++ b/experiments/src/main.rs
@@ -1,8 +1,5 @@
 #![no_std]
 #![no_main]
-//#![feature(const_in_array_repeat_expressions)]
-//#![feature(naked_functions)]
-//#![feature(asm)]
 
 extern crate alloc;
 
diff --git a/flake.nix b/flake.nix
index 675af87..c4b3cc9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -234,7 +234,7 @@
 
         installPhase = ''
           mkdir -p $out $out/nix-support
-          cp target/armv7-none-eabihf/release/${name} $out/${name}.elf
+          cp target/armv7a-none-eabihf/release/${name} $out/${name}.elf
           echo file binary-dist $out/${name}.elf >> $out/nix-support/hydra-build-products
         '';
 
diff --git a/libcortex_a9/src/lib.rs b/libcortex_a9/src/lib.rs
index e7bceba..144ef9c 100644
--- a/libcortex_a9/src/lib.rs
+++ b/libcortex_a9/src/lib.rs
@@ -1,6 +1,5 @@
 #![no_std]
 #![feature(never_type)]
-//#![feature(const_fn)]
 
 extern crate alloc;
 
@@ -16,7 +15,7 @@ pub mod sync_channel;
 mod uncached;
 pub use fpu::enable_fpu;
 pub use uncached::UncachedSlice;
-use core::arch::{global_asm, asm};
+use core::arch::global_asm;
 
 global_asm!(include_str!("exceptions.s"));
 
diff --git a/libcortex_a9/src/sync_channel.rs b/libcortex_a9/src/sync_channel.rs
index 5da28ec..cf04e6e 100644
--- a/libcortex_a9/src/sync_channel.rs
+++ b/libcortex_a9/src/sync_channel.rs
@@ -37,7 +37,7 @@ impl<'a, T> Sender<'a, T> where T: Clone {
             notify_spin_lock();
             if !prev.is_null() {
                 unsafe {
-                    Box::from_raw(prev);
+                    let _ = Box::from_raw(prev);
                 }
             }
             Ok(())
@@ -91,7 +91,7 @@ impl<'a, T> Sender<'a, T> where T: Clone {
         for v in self.list.iter() {
             let original = v.swap(core::ptr::null_mut(), Ordering::Relaxed);
             if !original.is_null() {
-                Box::from_raw(original);
+                let _ = Box::from_raw(original);
             }
         }
     }
@@ -170,35 +170,16 @@ impl<'a, T> Iterator for Receiver<'a, T> where T: Clone {
     }
 }
 
-macro_rules! count_tts {
-    () => {};
-    ($_head:tt $($tail:tt)*) => {1usize + count_tts!($($tail)*)};
-}
-
-const fn count_helper<const N: usize>(_: [(); N]) -> usize { N }
-
 #[macro_export]
 /// Macro for initializing the sync_channel with static buffer and indexes.
-/// Note that this requires `#![feature(const_in_array_repeat_expressions)]`
 macro_rules! sync_channel {
     ($t: ty, $cap: expr) => {
         {
-            // TODO remove const_in_array_repeat_expressions
             use core::sync::atomic::{AtomicUsize, AtomicPtr};
             use core::mem::MaybeUninit;
             use $crate::sync_channel::{Sender, Receiver};
-            static LIST: [AtomicPtr<$t>; $cap + 1] = [
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut()),
-                AtomicPtr::new(core::ptr::null_mut())];
+            const ATOMIC_NULL: AtomicPtr<$t> = AtomicPtr::new(core::ptr::null_mut());
+            static LIST: [AtomicPtr<$t>; $cap + 1] = [ATOMIC_NULL; $cap + 1];
             static WRITE: AtomicUsize = AtomicUsize::new(0);
             static READ: AtomicUsize = AtomicUsize::new(0);
             (Sender::new(&LIST, &WRITE, &READ), Receiver::new(&LIST, &WRITE, &READ))
diff --git a/libsupport_zynq/build.rs b/libsupport_zynq/build.rs
index 1bd1739..437ed98 100644
--- a/libsupport_zynq/build.rs
+++ b/libsupport_zynq/build.rs
@@ -10,7 +10,7 @@ fn compile_memcpy() {
     cfg.compiler("clang");
     cfg.no_default_flags(true);
     cfg.warnings(false);
-    cfg.flag("--target=armv7-none-eabihf");
+    cfg.flag("--target=armv7a-none-eabihf");
     let sources = vec![
         "memcpy.S",
     ];
diff --git a/libsupport_zynq/src/lib.rs b/libsupport_zynq/src/lib.rs
index b47d712..6b360d6 100644
--- a/libsupport_zynq/src/lib.rs
+++ b/libsupport_zynq/src/lib.rs
@@ -2,8 +2,6 @@
 
 #![feature(alloc_error_handler)]
 #![feature(panic_info_message)]
-//#![feature(naked_functions)]
-//#![feature(asm)]
 
 pub extern crate alloc;
 pub extern crate compiler_builtins;
@@ -13,4 +11,3 @@ mod abort;
 #[cfg(feature = "panic_handler")]
 mod panic;
 pub mod ram;
-
diff --git a/remote_run.sh b/remote_run.sh
index 87fd4e0..85db9e7 100755
--- a/remote_run.sh
+++ b/remote_run.sh
@@ -17,5 +17,5 @@ target_folder=/tmp/zynq-\$USER
 
 ssh $target_host "mkdir -p $target_folder"
 rsync openocd/* $target_host:$target_folder
-rsync target/armv7-none-eabihf/release/experiments $target_host:$target_folder/experiments.elf
+rsync target/armv7a-none-eabihf/release/experiments $target_host:$target_folder/experiments.elf
 ssh $target_host "cd $target_folder; openocd -f zc706.cfg -c 'load_image experiments.elf; resume 0; exit'"