Hallo Lutz, On Wed, 17 Feb 2010 18:35:21 +0100, Lutz Ballaschke wrote: > Hi there, > > i have to program parts of the super I/O chip F71862 from Fintek on a > Jetway J7F2 x86 mini-ITX board. There is an existing linux driver > (f71882fg) which supports the hardware monitoring function of that chip > (FAN, TEMP, PWM) but not the VID function. Correct. Looking at the datasheet, I am not surprised... The VID controller has only 4 input pins, while all recent CPU models need 6, 7 of even 8. I have no idea why Fintek did this, but in practice this makes the VID feature of the F71862 essentially useless. > So i started coding to get this VID function working. Unfortunately i > got disappointed the moment i tried to read the base address out of the > VID configuration register: the value is > > 0x00 > > which i suppose is not the actual IO address, is it? Confused by the > datasheet telling the same i wondered if that means i can't use VID > function or just have to find out the default base address (like 0x3F8 > is default for UART which is also part of the F71862 chip) > Any idea? The base I/O of each logical device must be set by the BIOS prior to use. Some logical devices may have a default value but the VID one does not. If the BIOS did not set any address, you have to do it before enabling the logical device (setting bit 0 of register 0x30 to 1.) You are free to set the address to whatever you want, but I would suggest picking a multiple of at least 16, and making sure you won't hit already used ports (check in /proc/ioports.) Then again, I am not sure how the VID feature of this chip would be used on a recent system. -- Jean Delvare http://khali.linux-fr.org/wishlist.html _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
