Re: ASL fixing questions

[Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Wed, Feb 11, 2004 at 10:58:55PM -0500, Martijn Pieters wrote:
> Hi list,
> 
> Okay, so I have a nice new eMachines M6805, but ACPI support is screwed. 
> I am trying fix the AML the bios provided me, and iron out all the 
> errors and warnings. Attached my DSDT.dsl, as fixed so far.
> 
> So far I got rid of the warnings (_WAK didn't return anything; fixed 
> with examples from working DSTS-es, _BTS method didn't return anything 
> on some control paths; move return out of if statement down).
> 
> However, I am still stuck with 3 different error classes I have trouble 
> figuring out.
> 
> First of all, there are 7 references to a _PPC field on the CPU0 
> Processor object:
> 
> dsdt.dsl  2035: Store (Zero, \_PR.CPU0._PPC)
> Error    1022 -     Object does not exist ^  (\_PR.CPU0._PPC)

Do you have a SSDT table ?  If so, this object may be in that SSDT
instead.

> Now, _PPC is a ACPI 2.0 *Method*, not a field, and this ASL states it 
> adheres to ACPI _version 1.0_. My question: Is this a Microsoft-only 
> extension to the ACPI 1.0 spec and can I safely remove these _PPC lines 
> for Linux? They appear to set the CPU power states, but I am not sure 
> how to correctly set these from ASL otherwise.

Well, actually there is a lot of AML's that claims to be only 1.0
compliant but have a lot of 2.0 extensions...

> The second error is that there are 3 Field declarations that seem to 
> want to address more information than the OperationRegions they are 
> attached to:
> 
> dsdt.dsl  2953: PWST,   2,
> Error    1051 -    ^ Access width of Field Unit extends beyond region limit

You can fix it by compiling the kernel with CONFIG_ACPI_RELAX option.
I will read your the ASL, though, to be sure.

> I am not sure how to go about fixing these yet; I am not entirely sure 
> what the syntax means yet.
> 
> Last but not least, tehre is one Field declaration that wants to define 
> AnyAcc to a OperationRegion, something that apparently isn't possible:
> 
> dsdt.dsl  3235: Field (ERAM, AnyAcc, NoLock, Preserve)
> Error    1048 -           ^ Host Operation Region requires ByteAcc access

s/AnyAcc/ByteAcc on the faulty line, perhaps ;)

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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