--- /dev/null
+++ b/compiler/rustc_target/src/spec/aarch64_openwrt_linux_musl.rs
@@ -0,0 +1,14 @@
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let mut base = super::linux_musl_base::opts();
+    base.max_atomic_width = Some(128);
+
+    Target {
+        llvm_target: "aarch64-unknown-linux-musl".into(),
+        pointer_width: 64,
+        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".into(),
+        arch: "aarch64".into(),
+        options: TargetOptions { mcount: "\u{1}_mcount".into(), ..base },
+    }
+}
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1016,6 +1016,7 @@
     ("mips64-openwrt-linux-musl", mips64_openwrt_linux_musl),
     ("mips-openwrt-linux-musl", mips_openwrt_linux_musl),
     ("mipsel-openwrt-linux-musl", mipsel_openwrt_linux_musl),
+    ("aarch64-openwrt-linux-musl", aarch64_openwrt_linux_musl),
 }

 /// Warnings encountered when parsing the target `json`.