It is handled at the serial port driver level, not the tty level. You need
to turn on CONFIG_SERIAL_CONSOLE and CONFIG_MAGIC_SYSRQ, and issue a break
followed by the relevent character within 5 seconds on the serial TTY being
used as the kernel console.
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
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