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the serial console speed (i386 and amd64 only). If the previous stage boot loader requested a serial console (RB_SERIAL or RB_MULTIPLE) then the default speed is determined from the current serial port speed. Otherwise it is set to 9600 or the value of BOOT_COMCONSOLE_SPEED at compile time. This makes it possible to set the serial port speed once in /boot.config and the setting will propagate to boot2, loader and the kernel serial console.