we're using armstoneA9 ttymxc3 for RS485 (Modbus RTU). We have connected RX/TX to R/D as well as RTS to enable RE/DE on a SN65HVD10 transceiver. It's working perfect but while booting sequence. The problem seems that while booting the RTS is enabling driving the bus lines on the transceiver. This will disturb communication of all other devices for some seconds. How can I invert this RTS line while booting on U-boot and inside the kernel so that the driver will be disabled?
Thanks for answers.