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-rw-r--r--Documentation/i2c/busses/scx200_acb19
1 files changed, 18 insertions, 1 deletions
diff --git a/Documentation/i2c/busses/scx200_acb b/Documentation/i2c/busses/scx200_acb
index f50e69981ec6..7c07883d4dfc 100644
--- a/Documentation/i2c/busses/scx200_acb
+++ b/Documentation/i2c/busses/scx200_acb
@@ -2,14 +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: 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 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