diff --git a/tool/src/ec.rs b/tool/src/ec.rs
index 7b2fe5b..9bc43ef 100644
--- a/tool/src/ec.rs
+++ b/tool/src/ec.rs
@@ -16,7 +16,7 @@ pub enum Cmd {
     Probe = 1,
     Board = 2,
     Version = 3,
-    Debug = 4,
+    Print = 4,
     Spi = 5,
     Reset = 6,
 }
@@ -151,6 +151,23 @@ impl<T: Timeout> Ec<T> {
         Ok(i)
     }
 
+    pub unsafe fn print(&mut self, data: &[u8]) -> Result<usize, Error> {
+        let flags = 0;
+        for chunk in data.chunks(256 - 4) {
+            for i in 0..chunk.len() {
+                self.write(i as u8 + 4, chunk[i]);
+            }
+
+            self.write(2, flags);
+            self.write(3, chunk.len() as u8);
+            self.command(Cmd::Print)?;
+            if self.read(3) != chunk.len() as u8 {
+                return Err(Error::Verify);
+            }
+        }
+        Ok(data.len())
+    }
+
     pub unsafe fn spi(&mut self, target: SpiTarget, scratch: bool) -> Result<EcSpi<T>, Error> {
         let mut spi = EcSpi {
             ec: self,
diff --git a/tool/src/main.rs b/tool/src/main.rs
index 4906133..1ef633e 100644
--- a/tool/src/main.rs
+++ b/tool/src/main.rs
@@ -262,10 +262,23 @@ unsafe fn info() -> Result<(), Error> {
     Ok(())
 }
 
+unsafe fn print(message: &[u8]) -> Result<(), Error> {
+    iopl();
+
+    let mut ec = Ec::new(
+        StdTimeout::new(Duration::new(1, 0)),
+    )?;
+
+    ec.print(message)?;
+
+    Ok(())
+}
+
 fn usage() {
     eprintln!("  console");
     eprintln!("  flash [file]");
     eprintln!("  info");
+    eprintln!("  print [message]");
 }
 
 fn main() {
@@ -300,6 +313,16 @@ fn main() {
                     process::exit(1);
                 },
             },
+            "print" => for mut arg in args {
+                arg.push('\n');
+                match unsafe { print(&arg.as_bytes()) } {
+                    Ok(()) => (),
+                    Err(err) => {
+                        eprintln!("failed to print '{}': {:X?}", arg, err);
+                        process::exit(1);
+                    },
+                }
+            },
             _ => {
                 eprintln!("unknown subcommand '{}'", arg);
                 usage();