Date: Tue, 24 Mar 2009 15:07:48 +0000 From: "Bruce M. Simpson" <bms@FreeBSD.org> To: freebsd-current@freebsd.org, Mars G Miro <spry@anarchy.in.the.ph> Subject: Re: sk/msk no more Message-ID: <49C8F744.4020405@FreeBSD.org> In-Reply-To: <20090324114648.GC3329@stlux503.dsto.defence.gov.au> References: <f12f408a0903151922p22475836s1d840e8e2cf203a2@mail.gmail.com> <200903191126.15390.jhb@freebsd.org> <f12f408a0903192024h71235e1bg91e23a25a13352f1@mail.gmail.com> <200903201242.09167.jhb@freebsd.org> <20090324114648.GC3329@stlux503.dsto.defence.gov.au>
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Wilkinson, Alex wrote: > 0n Fri, Mar 20, 2009 at 12:42:08PM -0400, John Baldwin wrote: > > >mcfg is a mechanism for doing faster PCI config access using a memory mapped window. > > As opposed to what ? > As opposed to bit-banging all PCI configuration space accesses through a couple of low ISA I/O space ports (PCI Configuration Mechanism #1... in the PCI SIG specs.) :-) For years PCI was an x86/Intel only thing, architectures which don't have this notion of ISA I/O port space have used memory mapped windows like this for years. cheers, BMS
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