#define PL011_SERIAL_BASE 0x16000000
#define PL011_SERIAL_FLAG_REGISTER 0x18
#define PL011_SERIAL_BUFFER_FULL (1 << 5)

void pl011_putc(char c)
{
    /* Wait until the serial buffer is empty */
    while (*(volatile unsigned long*)(PL011_SERIAL_BASE + PL011_SERIAL_FLAG_REGISTER)
		    & (PL011_SERIAL_BUFFER_FULL));

    /* When it's empty, put our character at the base */
    *(volatile unsigned long*)PL011_SERIAL_BASE = c;
}