Date: Tue, 27 Jan 2004 15:28:31 -0500 From: John Baldwin <jhb@FreeBSD.org> To: Nate Lawson <nate@root.org>, "M. Warner Losh" <imp@bsdimp.com> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/share/man/man9 bus_alloc_resource.9 bus_set_resource.9 Message-ID: <200401271528.31581.jhb@FreeBSD.org> In-Reply-To: <20040127112940.W37323@root.org> References: <200401270604.i0R64Fpc076025@repoman.freebsd.org> <20040127.091238.05978307.imp@bsdimp.com> <20040127112940.W37323@root.org>
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On Tuesday 27 January 2004 02:55 pm, Nate Lawson wrote: > On Tue, 27 Jan 2004, M. Warner Losh wrote: > > In message: <200401270604.i0R64Fpc076025@repoman.freebsd.org> > > > > Nate Lawson <njl@FreeBSD.org> writes: > > : njl 2004/01/26 22:04:15 PST > > : > > : FreeBSD src repository > > : > > : Modified files: > > : share/man/man9 bus_alloc_resource.9 bus_set_resource.9 > > : Log: > > : Document my adventures in newbus land. Clarify some examples, > > : especially that count is in bytes, not bits. There are some drivers > > : that I think make this mistake. (I've seen counts of 16 in the tree). > > > > Counts of 16 in the tree are likely correct. Many devices have 8 or > > 16 or 32 io ports in ISA land. I've not seen any drivers make this > > mistake. Care to give an example? > > Well, for one ichsmb(4). It allocates 16 IO ports but only uses 8 > according to its .h. The netgraph bt3c driver allocates 8 but only uses > 5. I'm curious if wi/owi really need 64 IO ports. The hardware needs to reserve any resource ranges that it will answer. Thus, the entire length of a PCI BAR needs to be reserved to keep another device from thinking it can use a resource that is silently going to conflict with another device. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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