X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=Documentation%2Fi2c%2Fbusses%2Fscx200_acb;h=7c07883d4dfc054302561791cbef9366110d6edc;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=08c8cd1df60c505eb5328c2028a38e73ef45a5fe;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git

diff --git a/Documentation/i2c/busses/scx200_acb b/Documentation/i2c/busses/scx200_acb
index 08c8cd1df..7c07883d4 100644
--- a/Documentation/i2c/busses/scx200_acb
+++ b/Documentation/i2c/busses/scx200_acb
@@ -2,13 +2,31 @@ Kernel driver scx200_acb
 
 Author: Christer Weinigel <wingel@nano-system.com>
 
+The driver supersedes the older, never merged driver named i2c-nscacb.
+
 Module Parameters
 -----------------
 
-* base: int
-  Base addresses for the ACCESS.bus controllers
+* base: up to 4 ints
+  Base addresses for the ACCESS.bus controllers on SCx200 and SC1100 devices
+
+  By default the driver uses two base addresses 0x820 and 0x840.
+  If you want only one base address, specify the second as 0 so as to
+  override this default.
 
 Description
 -----------
 
-Enable the use of the ACCESS.bus controllers of a SCx200 processor.
+Enable the use of the ACCESS.bus controller on the Geode SCx200 and
+SC1100 processors and the CS5535 and CS5536 Geode companion devices.
+
+Device-specific notes
+---------------------
+
+The SC1100 WRAP boards are known to use base addresses 0x810 and 0x820.
+If the scx200_acb driver is built into the kernel, add the following
+parameter to your boot command line:
+  scx200_acb.base=0x810,0x820
+If the scx200_acb driver is built as a module, add the following line to
+the file /etc/modprobe.conf instead:
+  options scx200_acb base=0x810,0x820