ASL fixing questions

[Martijn Pieters <mj-a5Jd59zECFiB+jHODAdFcQ@public.gmane.org>]

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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)

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.

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

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

Again, I have no clue yet how to go about fixing this error, if at all 
possible.

Any help or hints is greatly appreciated!

Martijn Pieters


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