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

[Warner Losh]

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