Remove default implementations for drivers

diff --git a/src/console.rs b/src/console.rs
index 87ab382..b4f2c51 100644
--- a/src/console.rs
+++ b/src/console.rs

@@ -74,14 +74,6 @@
     }
 }
 
-impl Default for Console {
-    fn default() -> Self {
-        Console {
-            allow_buffer: [0; 64],
-        }
-    }
-}
-
 impl fmt::Write for Console {
     fn write_str(&mut self, string: &str) -> Result<(), fmt::Error> {
         self.write(string).map_err(|_| fmt::Error)

diff --git a/src/debug/mod.rs b/src/debug/mod.rs
index f67ae9b..1e55bb3 100644
--- a/src/debug/mod.rs
+++ b/src/debug/mod.rs

@@ -1,20 +1,23 @@
 //! Heapless debugging functions for Tock troubleshooting
 
 mod low_level_debug;
+use crate::drivers::Drivers;
 pub use low_level_debug::*;
 
-use crate::console::Console;
+use crate::retrieve_drivers_unsafe;
 
 pub fn println() {
     let buffer = [b'\n'];
-    let mut console = Console::default();
+    let Drivers { console_driver, .. } = unsafe { retrieve_drivers_unsafe() };
+    let mut console = console_driver.create_console();
     let _ = console.write(&buffer);
 }
 
 pub fn print_as_hex(value: usize) {
     let mut buffer = [b'\n'; 11];
     write_as_hex(&mut buffer, value);
-    let mut console = Console::default();
+    let Drivers { console_driver, .. } = unsafe { retrieve_drivers_unsafe() };
+    let mut console = console_driver.create_console();
     let _ = console.write(buffer);
 }
 
@@ -26,7 +29,8 @@
     let mut buffer = [b'\n'; 15];
     buffer[0..4].clone_from_slice(b"SP: ");
     write_as_hex(&mut buffer[4..15], stack_pointer);
-    let mut console = Console::default();
+    let Drivers { console_driver, .. } = unsafe { retrieve_drivers_unsafe() };
+    let mut console = console_driver.create_console();
     let _ = console.write(buffer);
 }
 
@@ -50,7 +54,8 @@
         }
     }
     buffer[27] = b'\n';
-    let mut console = Console::default();
+    let Drivers { console_driver, .. } = retrieve_drivers_unsafe();
+    let mut console = console_driver.create_console();
     let _ = console.write(&buffer);
 }