i2c/busses/i2c-piix4.rst

2 Kernel driver i2c-piix4
9   * ServerWorks OSB4, CSB5, CSB6, HT-1000 and HT-1100 southbridges
18   * AMD Hudson-2, ML, CZ
26 	- Frodo Looijaard <frodol@dds.nl>
27 	- Philip Edelbrock <phil@netroedge.com>
31 -----------------
40 -----------
43 functionality. Among other things, it implements the PCI bus. One of its
44 minor functions is implementing a System Management Bus. This is a true
45 SMBus - you can not access it on I2C levels. The good news is that it
47 timing problems. The bad news is that non-SMBus devices connected to it can
50 Do ``lspci -v`` and see whether it contains an entry like this::
55 Bus and device numbers may differ, but the function number must be
74 The PIIX/PIIX3 does not implement an SMBus or I2C bus, so you can't use
80 The AMD SB700, SB800, SP5100 and Hudson-2 chipsets implement two
81 PIIX4-compatible SMBus controllers. If your BIOS initializes the
85 If you own Force CPCI735 motherboard or other OSB4 based systems you may need
92    for all possible PCI ids (and ``lspci -n`` to match them). Let's assume the
95    command: ``lspci -xxx -s 00:0f.0``
97    ``setpci  -s 00:0f.0 d2.b=1``
103 Hardware-specific issues
104 ------------------------