BBB Arch Linux Device Tree

Hi everyone,

I install Arch Linux on BBB e-MMC. I need serial port and read this(http://hipstercircuits.com/enable-serialuarttty-on-beaglebone-black/) article.

I just copy & paste “nano enable-uart5.dts”, after paste enable uart5 code in nano.

Save & exit enable-uart5.dts file.

I try compile this file with dtc,
dtc -O dtb -o enable-uart5-00A0.dtbo -b 0 -@ enable-uart5.dts
Compiler return -h message, -@ argument isn’t accept dtc.

I remove -@ argument and try again, this time compiler return error message

[root@alarm ~]# dtc -O dtb -o enable-uart5-00A0.dtbo -b 0 enable-uart5.dts
Error: enable-uart5.dts:1.1-2 syntax error
FATAL ERROR: Unable to parse input tree

What can I do?
Thank you.
Best Regards.