From owner-freebsd-arm@FreeBSD.ORG  Fri Mar  2 17:19:44 2007
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Date: Fri, 02 Mar 2007 10:17:44 -0700 (MST)
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To: krassi@bulinfo.net
From: Warner Losh <imp@bsdimp.com>
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	Fri, 02 Mar 2007 10:17:44 -0700 (MST)
Cc: freebsd-arm@FreeBSD.org
Subject: Re: IIC support?
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> I have problems to access the iic eeprom from userland. Even after set 
> SCAN_IICBUS in iicbus.c nothing has been detected. I have made some 
> tests from the bootloader to read/write from/to the eeprom and they work.
> Is there any known problems with TWI or any differences between board 
> settings?

The IIC bus is not a self enumerating bus.  Bad things happen when you
go out and try to 'probe' it, although often you can get away with
that.  FreeBSD takes a conservative approach.  You need hints for each
iic device on bus that you have on your board.

Warner