diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 531ddd1..ec5f9ad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         rust-toolchain: [nightly]
-        targets: [x86_64-unknown-linux-gnu, x86_64-unknown-none, riscv64gc-unknown-none-elf, aarch64-unknown-none-softfloat]
+        targets: [x86_64-unknown-linux-gnu, x86_64-unknown-none]
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly
@@ -22,7 +22,7 @@ jobs:
     - name: Check code format
       run: cargo fmt --all -- --check
     - name: Clippy
-      run: cargo clippy --target ${{ matrix.targets }} --all-features -- -A clippy::new_without_default
+      run: cargo clippy --target ${{ matrix.targets }} --all-features -- -D warnings
     - name: Build
       run: cargo build --target ${{ matrix.targets }} --all-features
     - name: Unit test
diff --git a/.gitignore b/.gitignore
index ff78c42..23bb4fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 /target
 /.vscode
 .DS_Store
-Cargo.lock
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f6493cb
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,53 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "bit_field"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc827186963e592360843fb5ba4b973e145841266c1357f7180c43526f2e5b61"
+
+[[package]]
+name = "bitflags"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "rustversion"
+version = "1.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7c45b9784283f1b2e7fb61b42047c2fd678ef0960d4f6f1eba131594cc369d4"
+
+[[package]]
+name = "volatile"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "442887c63f2c839b346c192d047a7c87e73d0689c9157b00b53dcc27dd5ea793"
+
+[[package]]
+name = "x86_64"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f042214de98141e9c8706e8192b73f56494087cc55ebec28ce10f26c5c364ae"
+dependencies = [
+ "bit_field",
+ "bitflags",
+ "rustversion",
+ "volatile",
+]
+
+[[package]]
+name = "x86_rtc"
+version = "0.1.1"
+dependencies = [
+ "cfg-if",
+ "x86_64",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 2471d01..f7f7d53 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,3 +16,6 @@ cfg-if = "1.0"
 
 [target.'cfg(target_arch = "x86_64")'.dependencies]
 x86_64 = "0.15"
+
+[lints.clippy]
+new_without_default = "allow"
diff --git a/src/lib.rs b/src/lib.rs
index 45fff40..975fc01 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -205,15 +205,15 @@ cfg_if::cfg_if! {
 
         fn read_cmos_register(register: u8) -> u8 {
             unsafe {
-                COMMAND_PORT.write(CMOS_DISABLE_NMI | register);
-                DATA_PORT.read()
+                (*{ &raw mut COMMAND_PORT }).write(CMOS_DISABLE_NMI | register);
+                (*{ &raw mut DATA_PORT }).read()
             }
         }
 
         fn write_cmos_register(register: u8, value: u8) {
             unsafe {
-                COMMAND_PORT.write(CMOS_DISABLE_NMI | register);
-                DATA_PORT.write(value)
+                (*{ &raw mut COMMAND_PORT }).write(CMOS_DISABLE_NMI | register);
+                (*{ &raw mut DATA_PORT }).write(value)
             }
         }