Date: Wed, 6 Oct 2004 10:54:42 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Warner Losh <imp@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/pci pci_bus.c Message-ID: <200410061054.42956.jhb@FreeBSD.org> In-Reply-To: <200410060722.i967MwsJ014694@repoman.freebsd.org> References: <200410060722.i967MwsJ014694@repoman.freebsd.org>
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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. -- 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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