/** Return the default block device
*
* Returns the default block device based on the configuration JSON.
* Use the components in target.json or application config to change
* the default block device.
*
* An application can override all target settings by implementing
* BlockDevice::get_default_instance() - the default
* definition is weak, and calls get_target_default_instance().
*/
static BlockDevice *get_default_instance();
The document in BlockDevice said this function will call get_target_default_instance, but the implementation just calls the default constructor, which not match the document, and the subclass of BlockDevice e.g. QSPIFBlockDevice has no static member called get_target_default_instance