Date: Sun, 24 Apr 2005 23:16:11 -0700 From: Marcel Moolenaar <marcel@xcllnt.net> To: "M. Warner Losh" <imp@bsdimp.com> Cc: perforce@freebsd.org Subject: Re: PERFORCE change 75921 for review Message-ID: <c228a787d0ab62d16e6c7457b9c5dba5@xcllnt.net> In-Reply-To: <20050424.234915.41699183.imp@bsdimp.com> References: <200504250459.j3P4xWxs057683@repoman.freebsd.org> <20050424.234915.41699183.imp@bsdimp.com>
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On Apr 24, 2005, at 10:49 PM, M. Warner Losh wrote: > In message: <200504250459.j3P4xWxs057683@repoman.freebsd.org> > Marcel Moolenaar <marcel@freebsd.org> writes: > : http://perforce.freebsd.org/chv.cgi?CH=75921 > : > : Change 75921 by marcel@marcel_nfs on 2005/04/25 04:59:01 > : > : Allow VGA resources across PCI-PCI bridges. Required to > : support a PCI based VGA driver with the VGA hardware > : behind a PCI-PCI bridge. > > WE need to make sure that the ISA bit and VGA bits are set properly on > those bridges with vga children and peers of bridges with vga > children before allowing this... Ideally, yes. But since only one PCI device of class display and subclass VGA can have the legacy VGA addresses enabled and we're not mucking with the system configuration in that respect, we're not really doing anything dangerous by allowing the VGA addresses without such scrutiny provided we don't try to allocate those addresses for any ol' VGA display device that we find on the PCI busses in the system. -- Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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