Date: Fri, 7 Feb 2014 15:27:41 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Julian Stecklina <jsteckli@os.inf.tu-dresden.de> Subject: Re: [PATCH] PCI bus number management Message-ID: <201402071527.41452.jhb@freebsd.org> In-Reply-To: <ld2kdq$srr$1@ger.gmane.org> References: <201402061437.53355.jhb@freebsd.org> <ld2kdq$srr$1@ger.gmane.org>
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On Friday, February 07, 2014 7:43:51 am Julian Stecklina wrote: > On 02/06/2014 08:37 PM, John Baldwin wrote: > > I would like to commit this to HEAD soon but thought I would post it for some > > pre-commit testing for the brave. :) If you are really brave, try booting > > with 'hw.pci.clear_buses=1' which will force the kernel to renumber all buses > > in the system. > > This is a really bad idea, because BIOS/SMM tends to have those > hardcoded. Or am I misunderstanding the purpose of this patch? The BIOS just programs them initially. By default we use whatever the BIOS programs and only rely on this infrastructure if we need to grow the tree for some reason (e.g. hotplug). However, it is definitely valid for an OS to reassign bus numbers as it sees fit. -- John Baldwin
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