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H A Dqemu-options.hx88e020e5 Fri Dec 20 07:44:53 CST 2013 Ingo van Lil <inguin@gmx.de> doc: Mention chardev:id in available devices for -serial

It is possible to pre-define a character device with the -chardev option
and reference its id as serial device. The man page does not mention this
feature.

Use case: Use stdio as serial, but do not terminate VM on Ctrl-C
-chardev stdio,id=mystdio,signal=off -serial chardev:mystdio

Signed-off-by: Ingo van Lil <inguin@gmx.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>