Date: Wed, 6 Oct 2004 15:22:30 -0400 From: John Baldwin <jhb@FreeBSD.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/pci pci_bus.c Message-ID: <200410061522.30987.jhb@FreeBSD.org> In-Reply-To: <20041006.130850.64789190.imp@bsdimp.com> References: <200410060722.i967MwsJ014694@repoman.freebsd.org> <200410061054.42956.jhb@FreeBSD.org> <20041006.130850.64789190.imp@bsdimp.com>
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On Wednesday 06 October 2004 03:08 pm, M. Warner Losh wrote: > In message: <200410061054.42956.jhb@FreeBSD.org> > > John Baldwin <jhb@FreeBSD.org> writes: > : On Wednesday 06 October 2004 03:22 am, Warner Losh wrote: > : > imp 2004-10-06 07:22:58 UTC > : > > : > FreeBSD src repository > : > > : > Modified files: > : > sys/i386/pci pci_bus.c > : > Log: > : > For legacy PCI bridges, limit memory allocation to the top 32MB of > : > RAM. Many older, legacy bridges only allow allocation from this > : > range. This only appies to devices who don't have their memory > : > assigned by the BIOS (since we allocate the ranges so assigned > : > exactly), so should have minimal impact. > : > > : > 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. > > Can you point me at the details on how to do this? I'd be absolutely > thrilled to do this correctly, but so far my research has been focused > on the actual host bridges. Sadly, these aren't standardized. If > there's another area I can research, I'd be thrilled. Ugh, it turns out that the SMAP doesn't list memio space, it just lists where there is memory. This might be a start at least but it's only part of a fix. -- 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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