Vladimir Petrovic Posted May 11, 2018 Posted May 11, 2018 Hi, I have a problem to comunicate with sim800l via UART3 or any other UART. Is there way to activate UART3 on Linux PiOne 4.14.18-sunxi kernel if it is not already activated. I could find DTB files but I do not know how to view them or transfer to DTS and read/modify them to se if there could be a problem. I'm using pins 8 and 10 for UART3 on 40Pin header and try to comunicate with putty and screen over /dev/ttyS3 but no luck. Any idea what is going on? Sim800L works fine over pl2303.
martinayotte Posted May 11, 2018 Posted May 11, 2018 With Mainline, you need to activate some overlays to get specific peripherals. Read this page https://docs.armbian.com/User-Guide_Allwinner_overlays/ You should see that adding "uart3" to overlays variable in /boot/armbianEnv.txt will do the job.
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