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Date: Mon, 05 Mar 2007 16:17:11 +0200
From: Krassimir Slavchev <krassi@bulinfo.net>
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To: Warner Losh <imp@bsdimp.com>
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Cc: freebsd-arm@FreeBSD.org
Subject: Re: IIC support?
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Warner Losh wrote:
>> 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.
>
>   
Ok, that was just for testing.

I am trying to write a driver for pcf8563 (RTC similar to ds1672) but 
when I call the iicbus_transfer() function the iicbus_transfer_gen() is 
called instead of at91_twi_transfer().
In the kernel config file I have:
...
device   at91_twi
device   iicbus
...

Is this correct or I miss something else?
> Warner
>
>