linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / Documentation / i2c / busses / i2c-piix4

diff --git a/Documentation/i2c/busses/i2c-piix4 b/Documentation/i2c/busses/i2c-piix4
index 9214763..856b4b8 100644 (file)
--- a/Documentation/i2c/busses/i2c-piix4
+++ b/Documentation/i2c/busses/i2c-piix4
@@ -4,10 +4,8 @@ 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
+  * ServerWorks OSB4, CSB5 and CSB6 southbridges
     Datasheet: Only available via NDA from ServerWorks
-  * ATI IXP southbridges IXP200, IXP300, IXP400
-    Datasheet: Not publicly available
   * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge
     Datasheet: Publicly available at the SMSC website http://www.smsc.com
 
@@ -23,6 +21,8 @@ Module Parameters
   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
@@ -63,36 +63,10 @@ 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 Victory66 are
+The ServerWorks Southbridges, the Intel 440MX, and the Victory766 are
 identical to the PIIX4 in I2C/SMBus support.
 
-If you own Force CPCI735 motherboard or other OSB4 based systems you may need
-to change the SMBus Interrupt Select register so the SMBus controller uses
-the SMI mode.
-
-1) Use lspci command and locate the PCI device with the SMBus controller:
-   00:0f.0 ISA bridge: ServerWorks OSB4 South Bridge (rev 4f)
-   The line may vary for different chipsets. Please consult the driver source
-   for all possible PCI ids (and lspci -n to match them). Lets assume the
-   device is located at 00:0f.0.
-2) Now you just need to change the value in 0xD2 register. Get it first with
-   command: lspci -xxx -s 00:0f.0
-   If the value is 0x3 then you need to change it to 0x1
-   setpci  -s 00:0f.0 d2.b=1
-
-Please note that you don't need to do that in all cases, just when the SMBus is
-not working properly.
-
-
-Hardware-specific issues
-------------------------
-
-This driver will refuse to load on IBM systems with an Intel PIIX4 SMBus.
-Some of these machines have an RFID EEPROM (24RF08) connected to the SMBus,
-which can easily get corrupted due to a state machine bug. These are mostly
-Thinkpad laptops, but desktop systems may also be affected. We have no list
-of all affected systems, so the only safe solution was to prevent access to
-the SMBus on all IBM systems (detected using DMI data.)
-
-For additional information, read:
-http://www2.lm-sensors.nu/~lm78/cvs/lm_sensors2/README.thinkpad
+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.