[coreboot] genpowernow

[Rudolf Marek]

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Hi all,

I'm attaching my very experimental util, which can generate ACPI powernow
objects. It needs for pre K8 rev F a table entry which can be easily added from
datasheet. (So far there is Opteron 175 and some 4400 system.

For k8 revF it should follow an algorithm in BKDG to generate the table.
That code is totally UNTESTED - I dont have any access to revF system.

For pre revF it works quite fine, it produces same result as proprietary BIOS
except the bus latency value, which is recommended to 7 by AMD but my BIOS gives
there 9. (output.txt) If you want to compare with original bios use acpidump to
dump the SSDT table and iasl -d to get the text result.

So if you want to give a try, you will need to add your system to atable and
check the
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf

For the table. Maybe AMD has some other form of the table ready to use by
programs/parsers?

The C structure quite follows the table entries so it is easy to add it there.

If someone have time (I dont :/) it would be nice to see if the revF algo works
or get fixed.

It uses cpuid.c from x86info - it must be linked like gcc cpuid.c genpowernow.c
- -o genpowernow

Comments/suggestions/FIXES/IMPROVEMENTS welcome :)

Thanks,
Rudolf
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