[U-Boot-Users] Using a second I2C interface

Ben Warren bwarren at qstreams.com
Mon May 15 16:09:38 CEST 2006


Marc,

I'm going to implement something similar to what you've suggested, but
like this:

iprobe <chip>[.1, .2]...

instead of

iprobe[.1, .2] <chip> ...

This 2-controller support will be conditionally compiled if
CONFIG_I2C_2_CTRLS is defined.  I should have some code to share this
afternoon.

regards,
Ben

On Fri, 2006-05-12 at 12:37 -0700, Howard, Marc wrote:

> > On May 12, 2006, at 9:36 AM, Ben Warren wrote:
> > 
> > > Hello,
> > >
> > > The CPU I'm using (MPC8349) has two hardware I2C interfaces, and  
> > > I'd like to access the second one in U-boot.  Implementing this  
> > > looks easy to me, but I don't want to reinvent the wheel if it's  
> > > already been done elsewhere.  Has anyone done this?  If not, I'll  
> > > follow up with a proposal.
> > 
> > Depending on what you want to do, you can cheat and just change the  
> > pointer to the 2nd interface.  If you want something more full  
> > featured up to the command level then I think some discussion would  
> > be required on how the commands should work for specifying which  
> > controller to use.
> > 
> > - kumar
> 
> OK, just as a suggestion how about an optional suffix on all the I2C
> commands. Ex:
> 
> iprobe.2 -- discover valid I2C interfaces on controller #2.
> 
> imw.0 (or just imw) -- memory write to address on controller #0 (or the
> only controller in most cases).
> 
> Seems like it wouldn't break anything to specify the controller this
> way.
> 
> Marc W. Howard
> 
> 
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642
> _______________________________________________
> U-Boot-Users mailing list
> U-Boot-Users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/u-boot-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.denx.de/pipermail/u-boot/attachments/20060515/1c7d8486/attachment.htm 


More information about the U-Boot mailing list