Files
operating-system/buildroot-external/board/raspberrypi/rootfs-overlay/usr/lib/udev/rules.d/99-com.rules

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KERNEL=="ttyAMA0", PROGRAM="/bin/sh -c '\
ALIASES=/proc/device-tree/aliases; \
if cmp -s $ALIASES/uart0 $ALIASES/serial0; then \
echo 0;\
elif cmp -s $ALIASES/uart0 $ALIASES/serial1; then \
echo 1; \
else \
exit 1; \
fi\
'", SYMLINK+="serial%c"
KERNEL=="ttyAMA1", PROGRAM="/bin/sh -c '\
ALIASES=/proc/device-tree/aliases; \
if [ -e /dev/ttyAMA0 ]; then \
exit 1; \
elif cmp -s $ALIASES/uart0 $ALIASES/serial0; then \
echo 0;\
elif cmp -s $ALIASES/uart0 $ALIASES/serial1; then \
echo 1; \
else \
exit 1; \
fi\
'", SYMLINK+="serial%c"
KERNEL=="ttyS0", PROGRAM="/bin/sh -c '\
ALIASES=/proc/device-tree/aliases; \
if cmp -s $ALIASES/uart1 $ALIASES/serial0; then \
echo 0; \
elif cmp -s $ALIASES/uart1 $ALIASES/serial1; then \
echo 1; \
else \
exit 1; \
fi \
'", SYMLINK+="serial%c"