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ARM Amba
ARM Amba UARTs are found on ARM systems such as the Raspberry Pi.
Files at ARM
Files at RPi
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
High speed modes of operation are also not enabled by default and these must be enabled in /boot.
/boot/config.txt
init_uart_clock=64000000
