the following patch was just integrated into master:
commit 42ad2006572ea784548a79aabfaa3b00295d1215
Author: Mike Loptien <[email protected]>
Date: Fri Mar 15 13:05:59 2013 -0600
Lippert Fam14 DSDT: Add secondary bus range to PCI0
Adding the 'WordBusNumber' macro to the PCI0
CRES ResourceTemplate in the Persimmon DSDT.
This sets up the bus number for the PCI0 device
and the secondary bus number in the CRS method.
This change came in response to a 'dmesg' error
which states:
'[FIRMWARE BUG]: ACPI: no secondary bus range in _CRS'
By adding the 'WordBusNumber' macro, ACPI can set
up a valid range for the PCIe downstream busses,
thereby relieving the Linux kernel from "guessing"
the valid range based off _BBN or assuming [0-0xFF].
The Linux kernel code that checks this bus range is
in `drivers/acpi/pci_root.c`. PCI busses can have
up to 256 secondary busses connected to them via
a PCI-PCI bridge. However, these busses do not
have to be sequentially numbered, so leaving out a
section of the range (eg. allowing [0-0x7F]) will
unnecessarily restrict the downstream busses.
This is the same change as made to Persimmon with
change-id I44f22:
http://review.coreboot.org/#/c/2592/
Change-Id: Ie36b60973c6a5f9076bb55c8f451532711a2f8a8
Signed-off-by: Mike Loptien <[email protected]>
Reviewed-on: http://review.coreboot.org/2737
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <[email protected]>
Build-Tested: build bot (Jenkins) at Fri Mar 15 20:18:51 2013, giving +1
Reviewed-By: Stefan Reinauer <[email protected]> at Sun Mar 17
19:55:03 2013, giving +2
See http://review.coreboot.org/2737 for details.
-gerrit
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