diff --git a/apps/system/components/DebugConsole/kata-debug-console/src/run.rs b/apps/system/components/DebugConsole/kata-debug-console/src/run.rs
index 43cdd56..9c7f4ec 100644
--- a/apps/system/components/DebugConsole/kata-debug-console/src/run.rs
+++ b/apps/system/components/DebugConsole/kata-debug-console/src/run.rs
@@ -12,13 +12,10 @@
 #![no_std]
 
 use core::slice;
-use kata_io;
 use kata_os_common::allocator;
 use kata_os_common::logger::KataLogger;
 use kata_os_common::sel4_sys;
 use kata_os_common::slot_allocator;
-use kata_shell;
-use kata_uart_client;
 use log::trace;
 
 use sel4_sys::seL4_CPtr;
diff --git a/apps/system/components/DebugConsole/kata-io/src/lib.rs b/apps/system/components/DebugConsole/kata-io/src/lib.rs
index 68e73d3..3a74f97 100644
--- a/apps/system/components/DebugConsole/kata-io/src/lib.rs
+++ b/apps/system/components/DebugConsole/kata-io/src/lib.rs
@@ -127,7 +127,7 @@ impl<R: Read> BufReader<R> {
     pub fn new(inner: R) -> BufReader<R> {
         const BUFFER_SIZE : usize = 1024;  // free to be changed
         BufReader {
-            inner: inner,
+            inner,
             buf: Box::new([0u8; BUFFER_SIZE]),
             pos: 0,
             cap: 0,
diff --git a/apps/system/components/DebugConsole/kata-line-reader/src/lib.rs b/apps/system/components/DebugConsole/kata-line-reader/src/lib.rs
index 5bce7e0..19bb949 100644
--- a/apps/system/components/DebugConsole/kata-line-reader/src/lib.rs
+++ b/apps/system/components/DebugConsole/kata-line-reader/src/lib.rs
@@ -38,6 +38,11 @@ pub struct LineReader {
     // Owned by LineReader to facilitate static allocation.
     buf: [u8; LINE_MAX],
 }
+impl Default for LineReader {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 
 fn get_u8(reader: &mut dyn io::Read) -> io::Result<u8> {
     let mut buf: [u8; 1] = [0u8];
diff --git a/apps/system/components/DebugConsole/kata-shell/src/lib.rs b/apps/system/components/DebugConsole/kata-shell/src/lib.rs
index 0acf35c..3de2a70 100644
--- a/apps/system/components/DebugConsole/kata-shell/src/lib.rs
+++ b/apps/system/components/DebugConsole/kata-shell/src/lib.rs
@@ -6,8 +6,6 @@ use alloc::vec::Vec;
 use core::fmt;
 use core::fmt::Write;
 use cpio::CpioNewcReader;
-use hex;
-use log;
 
 use kata_io as io;
 use kata_line_reader::LineReader;
@@ -124,7 +122,7 @@ fn dispatch_command(
     builtin_cpio: &[u8],
 ) {
     let mut args = cmdline.split_ascii_whitespace();
-    match args.nth(0) {
+    match args.next() {
         Some(command) => {
             // Statically binds command names to implementations fns, which are
             // defined below.
@@ -221,7 +219,7 @@ fn loglevel_command(
     args: &mut dyn Iterator<Item = &str>,
     output: &mut dyn io::Write,
 ) -> Result<(), CommandError> {
-    if let Some(level) = args.nth(0) {
+    if let Some(level) = args.next() {
         use log::LevelFilter;
         match level {
             "off" => log::set_max_level(LevelFilter::Off),
@@ -652,7 +650,7 @@ fn test_mlcontinuous_command(args: &mut dyn Iterator<Item = &str>) -> Result<(),
     extern "C" {
         fn mlcoord_set_continuous_mode(mode: bool);
     }
-    if let Some(mode_str) = args.nth(0) {
+    if let Some(mode_str) = args.next() {
         let mode = mode_str.parse::<bool>()?;
         unsafe {
             mlcoord_set_continuous_mode(mode);
@@ -779,7 +777,7 @@ fn test_timer_async_command(
 
     timer_service_oneshot(id, time_ms);
 
-    return Ok(());
+    Ok(())
 }
 
 /// Implements a command that starts a timer, blocking until the timer has
diff --git a/apps/system/components/DebugConsole/kata-shell/src/rz.rs b/apps/system/components/DebugConsole/kata-shell/src/rz.rs
index 7f57f4b..8b1596e 100644
--- a/apps/system/components/DebugConsole/kata-shell/src/rz.rs
+++ b/apps/system/components/DebugConsole/kata-shell/src/rz.rs
@@ -10,7 +10,6 @@ use core::ptr;
 use kata_memory_interface::kata_frame_alloc;
 use kata_memory_interface::ObjDescBundle;
 use kata_os_common::sel4_sys;
-use log;
 
 use sel4_sys::seL4_CapRights;
 use sel4_sys::seL4_CPtr;
@@ -21,8 +20,6 @@ use sel4_sys::seL4_RISCV_Page_Map as seL4_Page_Map;
 use sel4_sys::seL4_RISCV_Page_Unmap as seL4_Page_Unmap;
 use sel4_sys::seL4_RISCV_VMAttributes::Default_VMAttributes as seL4_Default_VMAttributes;
 
-use zmodem;
-
 use kata_io as io;
 
 #[derive(Debug)]
@@ -132,7 +129,7 @@ impl Drop for Upload {
 impl io::Write for Upload {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         let mut cursor = buf;
-        while cursor.len() > 0 {
+        while !cursor.is_empty() {
             let available_bytes = self.mapped_bytes - self.next_free;
             if available_bytes > 0 {
                 // Fill the current frame (as space permits).
@@ -156,7 +153,7 @@ impl io::Write for Upload {
                     self.unmap_current_frame()?;
                 }
             }
-            if cursor.len() == 0 { break }
+            if cursor.is_empty() { break }
 
             // Allocate another frame and map it for write.
             self.expand_and_map()?;
diff --git a/apps/system/components/DebugConsole/kata-uart-client/src/lib.rs b/apps/system/components/DebugConsole/kata-uart-client/src/lib.rs
index 037cddf..a4fa951 100644
--- a/apps/system/components/DebugConsole/kata-uart-client/src/lib.rs
+++ b/apps/system/components/DebugConsole/kata-uart-client/src/lib.rs
@@ -6,7 +6,8 @@ use kata_io as io;
 
 // Console logging interface.
 #[no_mangle]
-pub extern "C" fn logger_log(level: u8, msg: *const cstr_core::c_char) {
+#[allow(clippy::missing_safety_doc)]
+pub unsafe extern "C" fn logger_log(level: u8, msg: *const cstr_core::c_char) {
     use log::Level;
     let l = match level {
         x if x == Level::Error as u8 => Level::Error,
@@ -18,9 +19,7 @@ pub extern "C" fn logger_log(level: u8, msg: *const cstr_core::c_char) {
     if l <= log::max_level() {
         // TODO(sleffler): is the uart driver ok w/ multiple writers?
         let output: &mut dyn io::Write = &mut self::Tx::new();
-        unsafe {
-            let _ = writeln!(output, "{}", CStr::from_ptr(msg).to_str().unwrap());
-        }
+        let _ = writeln!(output, "{}", CStr::from_ptr(msg).to_str().unwrap());
     }
 }
 
@@ -29,6 +28,11 @@ const DATAPORT_SIZE: usize = 4096;
 pub struct Rx {
     dataport: &'static [u8],
 }
+impl Default for Rx {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 
 impl Rx {
     pub fn new() -> Rx {
@@ -60,6 +64,11 @@ impl io::Read for Rx {
 pub struct Tx {
     dataport: &'static mut [u8],
 }
+impl Default for Tx {
+    fn default() -> Self {
+        Self::new()
+    }
+}
 
 impl Tx {
     pub fn new() -> Tx {
diff --git a/apps/system/components/DebugConsole/zmodem/src/frame.rs b/apps/system/components/DebugConsole/zmodem/src/frame.rs
index f8e6829..c2d139f 100644
--- a/apps/system/components/DebugConsole/zmodem/src/frame.rs
+++ b/apps/system/components/DebugConsole/zmodem/src/frame.rs
@@ -1,4 +1,5 @@
 use alloc::string::String;
+use alloc::vec;
 use alloc::vec::Vec;
 use core::fmt;
 
@@ -46,9 +47,8 @@ impl Frame {
     }
 
     pub fn build(&self) -> Vec<u8> {
-        let mut out = Vec::new();
+        let mut out = vec![ZPAD];
 
-        out.push(ZPAD);
         if self.header == ZHEX {
             out.push(ZPAD);
         }
@@ -63,7 +63,7 @@ impl Frame {
 
         if self.header == ZHEX {
             let hex = out.drain(4..).collect::<Vec<u8>>().encode_hex::<String>();
-            out.extend_from_slice(&hex.as_bytes());
+            out.extend_from_slice(hex.as_bytes());
         }
 
         let tmp = out.drain(3..).collect::<Vec<_>>();
diff --git a/apps/system/components/DebugConsole/zmodem/src/proto.rs b/apps/system/components/DebugConsole/zmodem/src/proto.rs
index 0c6da92..852ef25 100644
--- a/apps/system/components/DebugConsole/zmodem/src/proto.rs
+++ b/apps/system/components/DebugConsole/zmodem/src/proto.rs
@@ -1,5 +1,6 @@
 use alloc::vec::Vec;
 use alloc::{format, vec};
+use alloc::string::ToString;
 
 use kata_io as io;
 use log::Level::Debug;
@@ -35,7 +36,7 @@ where
     Ok(true)
 }
 
-pub fn parse_header<'a, R>(mut r: R) -> io::Result<Option<Frame>>
+pub fn parse_header<R>(mut r: R) -> io::Result<Option<Frame>>
 where
     R: io::Read,
 {
@@ -209,10 +210,7 @@ fn unescape(escaped_byte: u8) -> u8 {
 }
 
 fn is_escaped(byte: u8) -> bool {
-    match byte {
-        ZCRCE | ZCRCG | ZCRCQ | ZCRCW => false,
-        _ => true,
-    }
+    !matches!(byte, ZCRCE | ZCRCG | ZCRCQ | ZCRCW)
 }
 
 /// Reads out one byte
@@ -254,7 +252,7 @@ where
     if let Some(size) = filesize {
         zfile_data += &format!(" {}", size);
     }
-    zfile_data += &format!("\0");
+    zfile_data += &"\0".to_string();
 
     debug!("ZFILE supplied data: {}", zfile_data);
     write_zlde_data(w, ZCRCW, zfile_data.as_bytes())