dogcow@babymeat.com (Tom Spindler) writes:

>1. http://support.intel.com/design/mobile/datashts/305262.htm
>   points out that BSEL[1:0] indicates the FSB multiplier; currently, the
>   speedstep code assumes that the frequency will always increase in units
>   of 100Mhz. This isn't the case for some of the newer chips - they use
>   133Mhz instead (which explains why my 1.86Ghz chip shows up as 1.4Ghz.)

I guess it is FSB/4. Maybe someone can verify this with a processor
with FSB800 and Enhanced Speedstep?

>2. http://www.intel.com/support/processors/mobile/pm/sb/cs-007981.htm
>   lists the voltages for the 90nm-process chips; somewhat vexingly, while
>   it gives a fixed voltage for the 'battery optimized mode', this
>   changes for the lowest-powered chips - and the 'maximum performance'
>   is a big ol' range of voltages (save for the 778, which has a lower
>   maximum performance voltage than any of the rest.)

The est driver knows a couple of chips. It is possible to
extend its table with data for the FSB533 processors, at
least for the two datapoints given by Intel. I am currently
doing this for a Pentium M 780 (2.26GHz FSB533) and it
switches nicely between 800MHz and 2.26GHz (est shows
600MHz and 1700GHz).

A real solution however should query that data from the ACPI-BIOS.