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ARM Amba

amba.jpg

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
/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
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