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Date: Mon, 05 Mar 2007 16:40:57 +0200
From: Krassimir Slavchev <krassi@bulinfo.net>
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To: "M. Warner Losh" <imp@bsdimp.com>,  freebsd-arm@freebsd.org
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Subject: Re: IIC support?
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M. Warner Losh wrote:
> In message: <45EC2667.9040004@bulinfo.net>
>             Krassimir Slavchev <krassi@bulinfo.net> writes:
> : 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?
>
> Should be correct.  What version of FreeBSD are you using?
>   
7.0-CURRENT, 2 days old
> Warner
>
>