Allen Briggs wrote:
> On Thu, Jul 13, 2006 at 03:42:04PM -0700, Garrett D'Amore wrote:
>   
>> This adds full addressing (10-bit) support to the i2c bitbang support in
>> NetBSD.  I don't have any 10-bit devices, so I cannot test, but it
>> doesn't seem to break 7-bit addressing at least:
>>     
>
> My only minor concern is if we should be explicitly disallowing
> the 10-bit address prefix.  Isn't that a legal address for 7-bit
> systems, however unlikely it is that someone would use it?
>   

Not according to the spec.  The address is reserved for use as a 10-bit
address.

> If I'm wrong, just tell me.  :-)
> If I'm right, it seems like there should be a diagnostic warning
> message if someone tries to access a device at that address.  It's
> not like the devices move around (at least not in any system I've
> played with).
>   

Maybe we should warn on error if code tries to use this prefix, as the
code would have to be buggy.  (I suppose it is possible that someone
created a device that uses this reserved address, but that device would
not be compliant, and it would have to be particularly poor judgement.)

    -- Garrett
> -allen
>
>   


-- 
Garrett D'Amore, Principal Software Engineer
Tadpole Computer / Computing Technologies Division,
General Dynamics C4 Systems
http://www.tadpolecomputer.com/
Phone: 951 325-2134  Fax: 951 325-2191