log: Add a console driver
It is useful to display log messages on the console. Add a simple driver to handle this. Note that this driver outputs to the console, which may be serial or video. It does not specifically select serial output. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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common/log_console.c
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