diff --git a/Cargo.toml b/Cargo.toml
index cf2d138..6c36be2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ members = [
     "allwinner-rt/macros",
     "examples/nezha-d1",
     "examples/sdmmc",
+    "rfel",
 ]
 
 [workspace.package]
diff --git a/rfel/Cargo.toml b/rfel/Cargo.toml
new file mode 100644
index 0000000..f9b5016
--- /dev/null
+++ b/rfel/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "rfel"
+version = "0.0.0"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+
+[dependencies]
+clap = { version = "4.5.20", features = ["derive"] }
+clap-verbosity-flag = "2.2.2"
+env_logger = "0.11.5"
+futures = "0.3.31"
+log = "0.4.22"
+nusb = "0.1.10"
diff --git a/rfel/README.md b/rfel/README.md
new file mode 100644
index 0000000..9b7e547
--- /dev/null
+++ b/rfel/README.md
@@ -0,0 +1,7 @@
+# rfel
+
+Rust Allwinner FEL command-line tool.
+
+## Reference
+
+XFEL project: https://github.com/xboot/xfel
diff --git a/rfel/src/main.rs b/rfel/src/main.rs
new file mode 100644
index 0000000..41f41be
--- /dev/null
+++ b/rfel/src/main.rs
@@ -0,0 +1,227 @@
+use core::fmt;
+
+use clap::Parser;
+use clap_verbosity_flag::Verbosity;
+use futures::executor::block_on;
+use log::{debug, error, trace};
+use nusb::transfer::EndpointType;
+
+#[derive(Parser)]
+#[clap(name = "rfel")]
+#[clap(about = "Allwinner FEL tool", long_about = None)]
+struct Cli {
+    #[clap(flatten)]
+    verbose: Verbosity,
+}
+
+/// USB vendor ID 0x1f3a: Allwinner Technology Co., Ltd.
+const VENDOR_ALLWINNER: u16 = 0x1f3a;
+/// Product 0xefe8: sunxi SoC OTG connector in FEL/flashing mode.
+const PRODUCT_FEL: u16 = 0xefe8;
+
+fn main() {
+    let cli = Cli::parse();
+    env_logger::Builder::new()
+        .filter_level(cli.verbose.log_level_filter())
+        .init();
+    let devices: Vec<_> = nusb::list_devices()
+        .expect("list devices")
+        .filter(|dev| dev.vendor_id() == VENDOR_ALLWINNER && dev.product_id() == PRODUCT_FEL)
+        .inspect(|dev| debug!("Allwinner FEL device {:?}", dev))
+        .collect();
+    if devices.len() == 0 {
+        error!("Cannot find any Allwinner FEL device connected.");
+        return;
+    }
+    if devices.len() > 1 {
+        error!("TODO: rfel does not support connecting to multiple Allwinner FEL devices by now.");
+        return;
+    }
+    let device = devices[0].open().expect("open USB device");
+    let mut interface = device.claim_interface(0).expect("open USB interface 0");
+    let fel = Fel::open_usb_interface(&mut interface).expect("open usb interface as an FEL device");
+    let version = fel.get_version();
+    println!("{:?}", version);
+}
+
+struct Fel<'a> {
+    iface: &'a mut nusb::Interface,
+    endpoint_in: u8,
+    endpoint_out: u8,
+    version: Option<Version>,
+}
+
+impl<'a> Fel<'a> {
+    #[inline]
+    pub fn open_usb_interface(iface: &'a mut nusb::Interface) -> Result<Self, ()> {
+        let mut endpoint_in = None;
+        let mut endpoint_out = None;
+        for descriptor in iface.descriptors() {
+            for endpoint in descriptor.endpoints() {
+                if endpoint.transfer_type() != EndpointType::Bulk {
+                    continue;
+                }
+                match endpoint.direction() {
+                    nusb::transfer::Direction::In => endpoint_in = Some(endpoint.address()),
+                    nusb::transfer::Direction::Out => endpoint_out = Some(endpoint.address()),
+                }
+            }
+        }
+        let (Some(endpoint_in), Some(endpoint_out)) = (endpoint_in, endpoint_out) else {
+            error!("Malformed device. Allwinner USB FEL device should include exactly one bulk in and one bulk out endpoint.");
+            return Err(());
+        };
+        debug!(
+            "Endpoint in ID 0x{:x}, out ID 0x{:x}",
+            endpoint_in, endpoint_out
+        );
+        Ok(Self {
+            iface,
+            endpoint_in,
+            endpoint_out,
+            version: None,
+        })
+    }
+
+    pub fn get_version(&self) -> Version {
+        self.version.unwrap_or_else(|| {
+            let mut buf = [0u8; 32];
+            self.send_fel_request(FelRequest::get_version());
+            self.usb_read(&mut buf);
+            self.read_fel_status();
+            unsafe { core::mem::transmute(buf) }
+        })
+    }
+
+    fn send_fel_request(&self, request: FelRequest) {
+        trace!("send_fel_request");
+        let buf: [u8; 36] = unsafe {
+            core::mem::transmute(UsbRequest::usb_write(
+                core::mem::size_of::<FelRequest>() as u32
+            ))
+        };
+        block_on(self.iface.bulk_out(self.endpoint_out, buf.to_vec()))
+            .status
+            .expect("send_usb_request on send_fel_request transfer");
+        let buf: [u8; 16] = unsafe { core::mem::transmute(request) };
+        block_on(self.iface.bulk_out(self.endpoint_out, buf.to_vec()))
+            .status
+            .expect("usb bulk out on send_fel_request transfer");
+        let buf = nusb::transfer::RequestBuffer::new(13);
+        let ans = block_on(self.iface.bulk_in(self.endpoint_in, buf));
+        ans.status
+            .expect("read_usb_response on send_fel_request transfer");
+        if ans.data != *b"AWUS\0\0\0\0\0\0\0\0\0" {
+            panic!("invalid data received from read_usb_response")
+        }
+    }
+
+    fn usb_read(&self, buf: &mut [u8]) {
+        trace!("usb_read");
+        let buf_1: [u8; 36] =
+            unsafe { core::mem::transmute(UsbRequest::usb_read(buf.len() as u32)) };
+        block_on(self.iface.bulk_out(self.endpoint_out, buf_1.to_vec()))
+            .status
+            .expect("send_usb_request on usb_read transfer");
+        let buf_2 = nusb::transfer::RequestBuffer::new(buf.len());
+        let ans = block_on(self.iface.bulk_in(self.endpoint_in, buf_2));
+        ans.status.expect("usb bulk out on usb_read transfer");
+        let buf_3 = nusb::transfer::RequestBuffer::new(13);
+        let ans_1 = block_on(self.iface.bulk_in(self.endpoint_in, buf_3));
+        ans_1
+            .status
+            .expect("read_usb_response on usb_read transfer");
+        if ans_1.data != *b"AWUS\0\0\0\0\0\0\0\0\0" {
+            panic!("invalid data received from read_usb_response")
+        }
+        buf.copy_from_slice(&ans.data);
+    }
+
+    fn read_fel_status(&self) {
+        trace!("read_fel_status");
+        let mut buf = [0u8; 8];
+        self.usb_read(&mut buf);
+    }
+}
+
+/// USB request.
+#[repr(C)]
+struct UsbRequest {
+    magic: [u8; 8],
+    length: u32,
+    unknown1: u32,
+    request: u16,
+    length2: u32,
+    pad: [u8; 10],
+}
+
+impl UsbRequest {
+    #[inline]
+    const fn usb_write(length: u32) -> Self {
+        UsbRequest {
+            magic: *b"AWUC\0\0\0\0",
+            request: 0x12,
+            length,
+            length2: length,
+            unknown1: 0x0c00_0000,
+            pad: [0; 10],
+        }
+    }
+    #[inline]
+    const fn usb_read(length: u32) -> Self {
+        UsbRequest {
+            magic: *b"AWUC\0\0\0\0",
+            request: 0x11,
+            length,
+            length2: length,
+            unknown1: 0x0c00_0000,
+            pad: [0; 10],
+        }
+    }
+}
+
+/// FEL request.
+#[repr(C)]
+struct FelRequest {
+    request: u32,
+    address: u32,
+    length: u32,
+    pad: u32,
+}
+
+impl FelRequest {
+    #[inline]
+    pub const fn get_version() -> Self {
+        FelRequest {
+            request: 0x001,
+            address: 0,
+            length: 0,
+            pad: 0,
+        }
+    }
+}
+
+#[derive(Copy, Clone)]
+#[repr(C)]
+struct Version {
+    magic: [u8; 8],
+    id: u32,
+    firmware: u32,
+    protocol: u16,
+    dflag: u8,
+    dlength: u8,
+    scratchpad: u32,
+    pad: [u8; 8],
+}
+
+impl fmt::Debug for Version {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_map()
+            .entry(&"magic", &String::from_utf8_lossy(&self.magic))
+            .entry(&"id", &self.id)
+            .entry(&"dflag", &self.dflag)
+            .entry(&"dlength", &self.dlength)
+            .entry(&"scratchpad", &self.scratchpad)
+            .finish()
+    }
+}