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Some Linux parameters can be set automatically by U-Boot, if it knows the device being used. For example, since U-Boot knows the serial console being used, it can add parameters for earlycon and console. Add support for this. Note that this is an experimental feature and we will see how useful it turns out to be. It is very handy for ChromeOS, since otherwise it is very difficult to manually determine the UART address or port number, particularly in a script. Provide an example of how this is used with ChromeOS. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>