Am Freitag, den 09.05.2008, 19:05 +0200 schrieb Jean Delvare: > > > Afterward i tried it with only 0x4c excluded and the smbus chip still > > works. With no exclusions lm75 detection hangs at 0x4c and afterwards i > > only get XX's from dumps. > > By "hangs" you mean it takes several seconds, or does it really stop? > Are you certain that it's the LM75 detection causing problem? We check > for no less than 33 different devices at address 0x4c... > ------------------------------------------------- Client found at address 0x4c Probing for `National Semiconductor LM75'... ------------------------------------------------- This is where it stops for a few seconds. i2cdump 0 0x4c w hangs in a way that i must cancle it with Ctrl-C and afterwards i need a reboot to get correct dumps. > Anyway, most certainly the problem is with word transactions on this > device you have at 0x4c. That won't be easy to work around, but I'll > take a look anyway, maybe I'll have an idea. If I do, I'll ask you - > again - to help with testing. As i noted in an other mail the interface can be accessed via the pci registers F3x1E80 (address) and F3x1EC0 (data). Bit 3 of pci register F3x1E40 indicates that this way of access is possible if unset (0b). But those addresses can not be accessed via /proc/bus/pci atm. > Thanks *a lot* for all the help you are > providing in this respect. > Glad I can help. I was curious for a long time how this i2c/smbus stuff works in detail, so that is a good situation to find out more about.
