diff --git a/tool/Cargo.toml b/tool/Cargo.toml
index dd1fd384..4a829ad4 100644
--- a/tool/Cargo.toml
+++ b/tool/Cargo.toml
@@ -20,9 +20,11 @@ clap = { version = "4.5", features = ["derive"], optional = true }
 libc = { version = "0.2", optional = true }
 # NOTE: Upgrading to 2.x blocked on Ubuntu shipping newer hidapi
 hidapi = { version = "1.5", default-features = false, features = ["linux-shared-hidraw"], optional = true }
-redox_hwio = { version = "0.1.6", default-features = false, optional = true }
 downcast-rs = { version = "1.2.0", default-features = false }
 
+[target.'cfg(any(target_arch = "x86", target_arch = "x86_64"))'.dependencies]
+redox_hwio = { version = "0.1.6", default-features = false, optional = true }
+
 [features]
 default = ["std", "hidapi", "clap"]
 std = ["libc", "downcast-rs/std"]
diff --git a/tool/src/access/mod.rs b/tool/src/access/mod.rs
index dad44334..da6bc5e7 100644
--- a/tool/src/access/mod.rs
+++ b/tool/src/access/mod.rs
@@ -11,9 +11,15 @@ pub use self::hid::AccessHid;
 #[cfg(feature = "hidapi")]
 mod hid;
 
-#[cfg(any(feature = "redox_hwio", all(feature = "std", target_os = "linux")))]
+#[cfg(all(
+    any(target_arch = "x86", target_arch = "x86_64"),
+    any(feature = "redox_hwio", all(feature = "std", target_os = "linux"))
+))]
 pub use self::lpc::*;
-#[cfg(any(feature = "redox_hwio", all(feature = "std", target_os = "linux")))]
+#[cfg(all(
+    any(target_arch = "x86", target_arch = "x86_64"),
+    any(feature = "redox_hwio", all(feature = "std", target_os = "linux"))
+))]
 mod lpc;
 
 /// Access method for running an EC command
diff --git a/tool/src/lib.rs b/tool/src/lib.rs
index 72bd0df6..129a662b 100644
--- a/tool/src/lib.rs
+++ b/tool/src/lib.rs
@@ -6,13 +6,12 @@
 //!
 //! There are some differences between targets and features that are listed below:
 //!  - `AccessHid` requires the `hidapi` feature. Only functional on USB ECs.
-//!  - `AccessLpcDirect` requires the `redox_hwio` feature and a nightly compiler. This method is
+//!  - `AccessLpcDirect` requires the `redox_hwio` feature and an x86 target. This method is
 //!    only recommended for use in firmware with LPC ECs, as mutual exclusion is not guaranteed.
-//!  - `AccessLpcLinux` requires the `std` feature and `linux` target_os. Recommended for LPC ECs,
-//!    as this method can utilize mutual exclusion.
-//!  - `EcLegacy`, `Pmc`, and `SuperIo` all require the `redox_hwio` feature and a nightly
-//!    compiler. It is only recommended to use these in firmware, as mutual exclusion is not
-//!    guaranteed.
+//!  - `AccessLpcLinux` requires the `std` feature, `linux` target_os, and x86 target. Recommended
+//!    for LPC ECs, as this method can utilize mutual exclusion.
+//!  - `EcLegacy`, `Pmc`, and `SuperIo` all require the `redox_hwio` feature and an x86 target.
+//!    It is only recommended to use these in firmware, as mutual exclusion is not guaranteed.
 
 #![allow(clippy::missing_safety_doc)]
 #![allow(clippy::needless_range_loop)]
@@ -33,22 +32,40 @@ mod error;
 pub use self::firmware::Firmware;
 mod firmware;
 
-#[cfg(feature = "redox_hwio")]
+#[cfg(all(
+    feature = "redox_hwio",
+    any(target_arch = "x86", target_arch = "x86_64")
+))]
 pub use self::legacy::EcLegacy;
-#[cfg(feature = "redox_hwio")]
+#[cfg(all(
+    feature = "redox_hwio",
+    any(target_arch = "x86", target_arch = "x86_64")
+))]
 mod legacy;
 
-#[cfg(feature = "redox_hwio")]
+#[cfg(all(
+    feature = "redox_hwio",
+    any(target_arch = "x86", target_arch = "x86_64")
+))]
 pub use self::pmc::Pmc;
-#[cfg(feature = "redox_hwio")]
+#[cfg(all(
+    feature = "redox_hwio",
+    any(target_arch = "x86", target_arch = "x86_64")
+))]
 mod pmc;
 
 pub use self::spi::{Spi, SpiRom, SpiTarget};
 mod spi;
 
-#[cfg(feature = "redox_hwio")]
+#[cfg(all(
+    feature = "redox_hwio",
+    any(target_arch = "x86", target_arch = "x86_64")
+))]
 pub use self::super_io::SuperIo;
-#[cfg(feature = "redox_hwio")]
+#[cfg(all(
+    feature = "redox_hwio",
+    any(target_arch = "x86", target_arch = "x86_64")
+))]
 mod super_io;
 
 #[cfg(feature = "std")]