Date: Fri, 16 Sep 2005 01:07:46 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/acpica acpi_pcib_acpi.c src/sys/i386/pci pci_bus.c Message-ID: <20050916.010746.98777894.imp@bsdimp.com> In-Reply-To: <200509160702.j8G72TBv063544@repoman.freebsd.org> References: <200509160702.j8G72TBv063544@repoman.freebsd.org>
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In message: <200509160702.j8G72TBv063544@repoman.freebsd.org>
Warner Losh <imp@FreeBSD.org> writes:
: imp 2005-09-16 07:02:29 UTC
:
: FreeBSD src repository
:
: Modified files:
: sys/dev/acpica acpi_pcib_acpi.c
: sys/i386/pci pci_bus.c
: Log:
: Commit a workaround to a problem with resource allocation. This helps
: with some Dell servers that booted w/o a problem[*] on 5.4, but failed
: with 6.0-BETA.
:
: On the PCI bus, when we do lazy resource allocation, we narrow the
: range requested as we pass through bridges to reflect how the bridges
: are programmed and what addresses they pass. However, when we're
: doing an allocation on a bus that's directly connected to a host
: bridge, no such translation can take place. We already had a fallback
: range for memory requests, but none for ioports. As such, provide a
: fallback for I/O ports so we don't allocate location 0, which will
: have undesired side effects when the resources are actually used.
:
: This fixes a problem with booting a Dell server with usb in the
: kernel. However, it is an unsatisfying solution. I don't like the
: hard coded value, and I think we should start narrowing the resources
: returned to not be in the so-called isa alias area (where the ranage &
: 0x0300 must be 0 iirc). Doing such filtering will have to wait for
: another day.
:
: This may be a good 6 candidate, maybe after its had a chance to be
: refined.
:
: Tested by: glebius@
for those interested in the omitted footnote:
[*] and also without its first usb controller: uhci0 failed to attach.
I don't think this is worthy of a forced commit, but I know how some
people are when they see dangling references...
Warner
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