# Tutorial 05 - UART0, PL011

This tutorial does the same as tutorial 04, but it prints the serial number on
UART0. As such, it can be used easily with qemu, like

```sh
$ make # To build the kernel
$ make qemu
<Press any key>
Hello Rustacean!
My serial number is: 0000000000000000
```

## uart.rs

Before we could use a rate divisor value, we must establish a valid clock rate
for the PL011. It's done via mailboxes, with the same property channel we used
earlier. Otherwise this interface is identical to the UART1 one.

## main.rs

We query the board's serial number and then we display it on the serial console.