Mike Loptien (mike.loptien@se-eng.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2739
-gerrit
commit c3d086e49f33ce939a4366fdb5d3be8dd937152c Author: Mike Loptien mike.loptien@se-eng.com Date: Fri Mar 15 13:22:32 2013 -0600
ASROCK Fam14 DSDT: Add OSC method
The _OSC method is used to tell the OS what capabilities it can take control over from the firmware. This method is described in chapter 6.2.9 of the ACPI spec v3.0. The method takes 4 inputs (UUID, Rev ID, Input Count, and Capabilities Buffer) and returns a Capabilites Buffer the same size as the input Buffer. This Buffer is generally 3 Dwords long consisting of an Errors Dword, a Supported Capabilities Dword, and a Control Dword. The OS will request control of certain capabilities and the firmware must grant or deny control of those features. We do not want to have control over anything so let the OS control as much as it can.
The _OSC method is required for PCIe devices and dmesg checks for its existence and issues an error if it is not found.
This is the same change made to Persimmon with Change-ID I149428: http://review.coreboot.org/#/c/2684/
Change-Id: I2701d915338294bdade2ad334b22a51db980892e Signed-off-by: Mike Loptien mike.loptien@se-eng.com --- src/mainboard/asrock/e350m1/dsdt.asl | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/src/mainboard/asrock/e350m1/dsdt.asl b/src/mainboard/asrock/e350m1/dsdt.asl index bc45435..feec7c9 100644 --- a/src/mainboard/asrock/e350m1/dsdt.asl +++ b/src/mainboard/asrock/e350m1/dsdt.asl @@ -1157,8 +1157,20 @@ DefinitionBlock ( Device(PCI0) { External (TOM1) External (TOM2) - Name(_HID, EISAID("PNP0A03")) + Name(_HID, EISAID("PNP0A08")) /* PCI Express Root Bridge */ + Name(_CID, EISAID("PNP0A03")) /* PCI Root Bridge */ Name(_ADR, 0x00180000) /* Dev# = BSP Dev#, Func# = 0 */ + + /* Operating System Capabilities Method */ + Method(_OSC,4) + { /* Check for proper PCI/PCIe UUID */ + If(LEqual(Arg0,ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766"))) + { + /* Let OS control everything */ + Return (Arg3) + } + } + Method(_BBN, 0) { /* Bus number = 0 */ Return(0) }