mca_find_unused_adapter — scan for unused adapters
int mca_find_unused_adapter (int id, int start);
Search the MCA configuration for adapters matching the 16bit
ID given. The first time it should be called with start as zero
and then further calls made passing the return value of the
previous call until MCA_NOTFOUND is returned.
Adapters that have been claimed by drivers and those that are disabled are not reported. This function thus allows a driver to scan for further cards when some may already be driven.