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Use a short sleep to bundle serial console reads so that we are not reading one character at a time which reduces busy looping. (From OE-Core rev: 3699e5bf2f9259266c49aaf69127183988b9d052) Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> (cherry picked from commit cafe65d8cf7544edbd387f7f5f6d77c64c6b18fa) Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>