dyo...@pobox.com said: > How many pcdisplay at isa can there be one machine?
Iirc, this code is originating from alpha where you can have multiple independant PCI/ISA/EISA hierarchies and thus multiple pcdisplay/ega/vga devices. > Can the two tags that pcdisplay_is_console() compared ever come from > different spaces? Yes, if there are independant ISA buses they are distinguished by their tags. > pcdisplay_is_console does not compare tag-handle tuples, it compares > only tags. Can it tell two instances of pcdisplay apart in that way? I think this is just a simplification -- since you can have only one pcdisplay per bus hierarchy you can have only one per tag. > > MI code needs to be able to check for equality at least. > I don't see the need. This is done at other places as well, eg in com.c, which is used by many (also embedded) architectures. (In this case, tag _and_ handle are compared -- one can have multiple com devices in any of multiple address spaces.) best regards Matthias ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzende des Aufsichtsrats: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Dr. Ulrich Krafft (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------