Date: Wed, 06 Oct 2004 13:26:55 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: nate@root.org Cc: jhb@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/pci pci_bus.c Message-ID: <20041006.132655.78073866.imp@bsdimp.com> In-Reply-To: <41644490.3050005@root.org> References: <200410060722.i967MwsJ014694@repoman.freebsd.org> <200410061054.42956.jhb@FreeBSD.org> <41644490.3050005@root.org>
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In message: <41644490.3050005@root.org>
Nate Lawson <nate@root.org> writes:
: >> Hoewver, for CardBus bridges (cbb), they rarely get the resources
: >> allocated by the BIOS, and this patch helps them greatly. Typically
: >> the 'bad Vcc' messages are caused by this problem.
: >
: > We really should be looking at the SMAP to find out what the real limits of
: > PCI space are I think since I think the SMAP includes an entry for PCI memory
: > mapped I/O.
:
: YES! More integrated SMAP awareness is especially important as more
: complex configs appear with different levels of reservation for upper
: memory besides just "reserved" or "available".
However, the current SMAP definition is about useless since it doesn't
tell us directly what we need to know. Well, it will give us an idea
of what we can exclude, but that still leaves a gap between 'all
that's excluded' and 'all that the host bridge passes'.
Warner
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