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-rw-r--r--hw/core/sysbus.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index c0f560b289..5d0887f499 100644
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -326,6 +326,17 @@ static void sysbus_device_class_init(ObjectClass *klass, void *data)
DeviceClass *k = DEVICE_CLASS(klass);
k->init = sysbus_device_init;
k->bus_type = TYPE_SYSTEM_BUS;
+ /*
+ * device_add plugs devices into a suitable bus. For "real" buses,
+ * that actually connects the device. For sysbus, the connections
+ * need to be made separately, and device_add can't do that. The
+ * device would be left unconnected, and will probably not work
+ *
+ * However, a few machines can handle device_add/-device with
+ * a few specific sysbus devices. In those cases, the device
+ * subclass needs to override it and set user_creatable=true.
+ */
+ k->user_creatable = false;
}
static const TypeInfo sysbus_device_type_info = {