[coreboot] DSDT: New warnings after adding _OSC method

[Paul Menzel]

Dear coreboot folks,


the patches adding the _OSC method to the DSDT, like [1][2][3],
introduce the following ACPI warnings [4][5], which went unnoticed by
the reviewers, myself included.

            IASL       coreboot-builds/amd_persimmon/mainboard/amd/persimmon/dsdt.ramstage.o
            CC         mainboard/amd/persimmon/get_bus_conf.ramstage.o

        Intel ACPI Component Architecture
        ASL Optimizing Compiler version 20100528 [Oct 15 2010]
        Copyright (c) 2000 - 2010 Intel Corporation
        Supports ACPI Specification Revision 4.0a

        dsdt.ramstage.asl  1143:    Method(_OSC,4)
        Warning  1088 -                       ^ Not all control paths return a value (_OSC)

        dsdt.ramstage.asl  1143:    Method(_OSC,4)
        Warning  1081 -                       ^ Reserved method must return a value (Buffer required for _OSC)

        ASL Input:  dsdt.ramstage.asl - 1724 lines, 34917 bytes, 889 keywords
        AML Output: dsdt.ramstage.aml - 10470 bytes, 409 named objects, 480 executable opcodes

        Compilation complete. 0 Errors, 2 Warnings, 0 Remarks, 494 Optimizations

It should be as simple as adding the following as commented in
[1 (Mar 14 12:23 AM)] already.

        } Else {
            Or(CDW1,4,CDW1)
            // Unrecognized UUID
            Return(Arg3)
        }

I am not submitting a patch, as the Sage folks are currently doing some
unification work, I do not want to interfere with.


Thanks,

Paul


[1] http://review.coreboot.org/#/c/2684/
[2] http://review.coreboot.org/#/c/2739/
[3] http://review.coreboot.org/#/c/2714/
[4] http://qa.coreboot.org/job/coreboot-gerrit/5591/testReport/(root)/board/i386_amd_persimmon/?
[5] http://qa.coreboot.org/job/coreboot-gerrit/5591/testReport/(root)/board/i386_intel_eagleheights/?
(logs will not be archived forever, so URL might be invalid)
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