cvs commit: src/sys/dev/acpica acpi_pcib_acpi.c src/sys/i386/pci pci_bus.c

Scott Long scottl at
Fri Sep 16 12:21:42 PDT 2005

Warner Losh wrote:
> 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@
>   Revision  Changes    Path
>   1.49      +2 -0      src/sys/dev/acpica/acpi_pcib_acpi.c
>   1.120     +2 -0      src/sys/i386/pci/pci_bus.c

Only the ACPI side of this patch works.  The legacy PCI side has no 
effect on the problem.


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