many embedded boards have a disconnected TTL level serial which can
generate some garbage that can lead to spurious false sysrq detects.
Signed-off-by: NJohn Crispin <john@phrozen.org>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>