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Not all QEMU machines are capable of having more than one serial port, this is due to the machine emulating a physical device/board. Rework QemuRunner to handle machines that only have 1 serial port, where the serial port shares output of the kernel log buffer and a login console. In this case the output is mixed but enables the machine to boot and have QemuRunner detect the login prompt. QemuTarget uses SERIAL_CONSOLES to determine the number of available serial ports. (From OE-Core rev: 333897c4a00b41681ffe34312a08cae09274327e) Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>