Date: Wed, 06 Oct 2004 12:16:32 -0700 From: Nate Lawson <nate@root.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/pci pci_bus.c Message-ID: <41644490.3050005@root.org> In-Reply-To: <200410061054.42956.jhb@FreeBSD.org> References: <200410060722.i967MwsJ014694@repoman.freebsd.org> <200410061054.42956.jhb@FreeBSD.org>
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John Baldwin wrote: > 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. 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". -Nate
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