default devices: core code & serial lines.
Qemu creates a default serial line for you in case you didn't specify one on the command line. Right now this is tied to the '-serial <chardev>' command line switch, which in turn causes trouble if you are creating your serial line via '-device isa-serial,<props>'. This patch adds a variable default_serial which says whenever a default serial line should be added. It is enabled by default. It is cleared when qemu finds '-serial' or '-device isa-serial' on the command line. Part of the patch is some infrastructure for the '-device $driver' checking (default_driver_check function) which will also be used by the other patches of this series. Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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