In embedded serial UART protocols (which may or may not use the RS232 physical voltage levels - often not) are very much still alive. When you bring up an embe

In embedded serial UART protocols (which may or may not use the RS232 physical voltage levels - often not) are very much still alive. When you bring up an embedded Linux device, be it based on an old or a brand new SoC the first thing to get running is the UART connection, first to the bootloader and then to the kernel.