[coreboot] AMD DBM690T PowerNow table problems

[Marc Jones]

On Sat, Jan 3, 2009 at 3:04 PM, Rudolf Marek <r.marek at assembler.cz> wrote:
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> Hi,
>
> Here we go.
>
> Its seems that the generated table has wrong conversion for frequency and its
> FID representation. In other words the table is OK but the first field is not
> consistent with FID and real freq.
>
> invalid freq entries 1000000 kHz vs. 800000
>
> This means that:
>
>
>                Package (0x06)
>                {
>                    0x00000320,. <--- here should be 0x3e8
>                    0x0000F230,.
>                    0x00000064,.
>                    0x00000007,.
>                    0xE8202F0A,.
>                    0x0000030A
>                },.
>
>                Package (0x06)
>                {
>                    0x00000320,.
>                    0x0000BB8C,.
>                    0x00000064,.
>                    0x00000007,.
>                    0xE8202C82,.
>                    0x00000482
>                }
>
>
> FID is 0A and 02 which means it should be: set to 0x3e8 and 0x320.
>
> I guess it is because your CPU is revF and not revG.
>
> fid_multiplier = ((cpuid1.edx & 0x40) >> 6) * 100;
>
> This line will cause that your CPU has fid_multiplier 0 instead of 100x.
> I believe that the multiplier should be always 100. Because revF CPU hav LSB in
> FID always 0.
>
> Rudolf

I agree with this analysis. Patch attached.

Marc
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