1) Yes, PECI pin in SuperIO is actually configured as PECI pin and is connected to PECI pin on Haswell CPU 2) I don't have secret PECI docs either, so I don't know what else should I do... 3) You're right, I want to configure SuperIO to control fans on motherboard based on CPU temperature.
-----Original Message----- From: Nico Huber [mailto:[email protected]] Sent: Monday, January 23, 2017 11:42 PM To: Аладышев Константин Cc: [email protected] Subject: Re: [coreboot] PECI temperature in lm-sensors On 23.01.2017 15:17, Аладышев Константин wrote: > Does someone have any experience with enabling PECI monitoring on > nuvoton SuperIOs ? > > I'm trying to enable it on board with Haswell+Lynxpoint CPU and > NCT6776 SuperIO. > > But all I see in lm-sensors output for now is zero temperature for > PECI Agent. I'd first make sure, that the PECI interface is actually connected to a PECI slave. Do you have evidence that this is the case? It's not unusual to leave it unconnected. > > Does coreboot have any SuperIO chips/Intel CPUs/motherboards, that > have this functional enabled? What is usually need to be done to > enable PECI monitoring? FWIW (cf. superio/ite/it8772f and others), you have to program the PECI slave address and the command used to retrieve the temperature readings. What to program seems to be documented in a secret PECI specification (I could only find a license agreement, WTF?). How to program it, is super i/o specific (see datasheet of your chip). I wonder though, what are you up to? You only need PECI if you want your super i/o to to something automatically (like fan control) based on the readings. If you only want to read out the temperature, you can also directly ask the processor (MSR 0x19c, IIRC). Nico -- coreboot mailing list: [email protected] https://www.coreboot.org/mailman/listinfo/coreboot
