P_R '-om' default is set agressively and does not match Olimex default

[chili-chips-ba]

@pu-cc what's the rationale behind setting the -om P_R default to the highest possible supply voltage? Note that Olimex board defaults to midpoint. That's a recipe for problems.

Please, help us also understand the implications of the P_R -tm option, as well as its interplay with the -om.

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[pu-cc]

what's the rationale behind setting the -om P_R default to the highest possible supply voltage?

It gives a good understanding what the design can achieve in best case (1.1V) and the worst conditions.

Please, help us also understand the implications of the P_R -tm option, as well as its interplay with the -om.

With -om, you specify the core voltage:

• 1: lowpower (0.9V)
• 2: economy (1.0V)
• 3: speed (1.1V)

In addition, the corner/conditions -tm can be specified, as this also has an effect on the timing:

• 1: fast corner, 125°C
• 2: typical corner, 25°C
• 3: worst corner, -40°C (default)

As far as i know, tools usually output their timings as "worst conditions".