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Jorge Guzman
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The cu application page was an empty stub. Document the command: description, options, escape sequences, configuration dependencies and limitations. Also add an rs485 configuration to the linum-stm32h753bi board with the two on-board RS-485 transceivers (UART4 and USART6) and the cu terminal enabled, plus a board documentation section showing how to bridge the console to one of the RS-485 buses with cu. The RS-485 DE pins are handled automatically by the serial driver. Tested on hardware. Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>