I've seen questions in the archive, but no adequate answers about exactly how to get the CPU temperature sensors working on the Tyan 2720 motherboard. The trouble is that there are two alternate sets of SMB devices that can not be activated at the same time. They are controlled by two GPIO lines on the Intel 82801CA ICH3-S. When GPIO27 and GPIO28 are both high, the EEPROMs on the memory chips, and some clock chip are activated. When GPIO27 is low and GPIO28 is high, then the CPU temperature sensors are activated. Unfortunately, the default seems to be to activate the EEPROMs in order to the information needed for booting and to leave them active. One must lower GPOI27 before the CPU temperature sensors will work. I have written a crude little device driver that does that, and now I can monitor the temperatures of my CPUs using the ADM1021 driver. The driver autodetects the Xeon temperature sensors as ADM1023, and that seems to work. It also works when you force them to ADM1021 as recommended in the module documentation. My xeons appear to be lightly used and well cooled. They read 25 to 27 deg C, with one spike up to 30 deg C. I wonder, though, why my other temperature sensor reads 74 deg C. That seems too hot. -- Joe Konczal <joseph.konczal at nist.gov> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: tyan2720-gpio.c Url: http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20030501/d2a95fda/attachment.c
