Kernel driver i2c-piix4 Supported adapters: * Intel 82371AB PIIX4 and PIIX4E * Intel 82443MX (440MX) Datasheet: Publicly available at the Intel website * ServerWorks OSB4, CSB5, CSB6 and HT-1000 southbridges Datasheet: Only available via NDA from ServerWorks * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge Datasheet: Publicly available at the SMSC website http://www.smsc.com Authors: Frodo Looijaard Philip Edelbrock Module Parameters ----------------- * force: int Forcibly enable the PIIX4. DANGEROUS! * force_addr: int Forcibly enable the PIIX4 at the given address. EXTREMELY DANGEROUS! * fix_hstcfg: int Fix config register. Needed on some boards (Force CPCI735). Description ----------- The PIIX4 (properly known as the 82371AB) is an Intel chip with a lot of functionality. Among other things, it implements the PCI bus. One of its minor functions is implementing a System Management Bus. This is a true SMBus - you can not access it on I2C levels. The good news is that it natively understands SMBus commands and you do not have to worry about timing problems. The bad news is that non-SMBus devices connected to it can confuse it mightily. Yes, this is known to happen... Do 'lspci -v' and see whether it contains an entry like this: 0000:00:02.3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (rev 02) Flags: medium devsel, IRQ 9 Bus and device numbers may differ, but the function number must be identical (like many PCI devices, the PIIX4 incorporates a number of different 'functions', which can be considered as separate devices). If you find such an entry, you have a PIIX4 SMBus controller. On some computers (most notably, some Dells), the SMBus is disabled by default. If you use the insmod parameter 'force=1', the kernel module will try to enable it. THIS IS VERY DANGEROUS! If the BIOS did not set up a correct address for this module, you could get in big trouble (read: crashes, data corruption, etc.). Try this only as a last resort (try BIOS updates first, for example), and backup first! An even more dangerous option is 'force_addr='. This will not only enable the PIIX4 like 'force' foes, but it will also set a new base I/O port address. The SMBus parts of the PIIX4 needs a range of 8 of these addresses to function correctly. If these addresses are already reserved by some other device, you will get into big trouble! DON'T USE THIS IF YOU ARE NOT VERY SURE ABOUT WHAT YOU ARE DOING! The PIIX4E is just an new version of the PIIX4; it is supported as well. The PIIX/PIIX3 does not implement an SMBus or I2C bus, so you can't use this driver on those mainboards. The ServerWorks Southbridges, the Intel 440MX, and the Victory766 are identical to the PIIX4 in I2C/SMBus support. A few OSB4 southbridges are known to be misconfigured by the BIOS. In this case, you have you use the fix_hstcfg module parameter. Do not use it unless you know you have to, because in some cases it also breaks configuration on southbridges that don't need it.