From: "KOCHI, Takayoshi" <t-kouchi@mvf.biglobe.ne.jp>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] PCI_BUSES_TO_SCAN off by 1?
Date: Fri, 30 Aug 2002 22:28:51 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590701906008@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590701906005@msgid-missing>
On Fri, 30 Aug 2002 15:11:20 -0600
Bjorn Helgaas <bjorn_helgaas@hp.com> wrote:
> > Is there any reason we don't scan the last PCI bus on IA64?
> > arch/ia64/kernel/pci.c has PCI_BUSES_TO_SCAN set to 255 instead
> > of 256, which prevents the kernel from scanning bus 255. This
> > causes is some problems since some of our machines (ie, the
> > Itanium2 "tiger") place chipset registers in PCI config space on
> > the last PCI bus.
>
> I agree, it sounds like an off-by-one error.
>
> Along this line, I had been hoping that if we find any PCI root
> bridges via ACPI, we could skip the blind scanning of buses 0-255.
> It sounds like skipping the blind scan might break tiger, though.
AFAIK, tiger defines PCI bus 255 as a host-bus bridge in ACPI.
Thanks,
--
KOCHI, Takayoshi <t-kouchi@cq.jp.nec.com/t-kouchi@mvf.biglobe.ne.jp>
next prev parent reply other threads:[~2002-08-30 22:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-30 20:45 [Linux-ia64] PCI_BUSES_TO_SCAN off by 1? Van Maren, Kevin
2002-08-30 21:11 ` Bjorn Helgaas
2002-08-30 21:14 ` Jack Steiner
2002-08-30 22:28 ` KOCHI, Takayoshi [this message]
2002-10-22 22:20 ` Bjorn Helgaas
2002-10-22 22:37 ` David Mosberger
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