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ARM Amba UART
These UARTs are found on systems such as the Raspberry Pi.
RPi
By default, the UART is used as the Linux console, this must be disabled to allow general purpose operation.
#!/bin/sh
C=`awk '{ for (i = 1; i <= NF; ++i) { if ($i !~ /ttyAMA0/) { printf $i" " } } printf "\n" }' /boot/cmdline.txt`
echo $C > /boot/cmdline.txt
/boot/config.txt
High speed modes of operation are also not enabled by default and these must be enabled in /boot.
init_uart_clock=64000000
