[U-Boot] Help with exporting memory power management info in u-boot

[Ankita Garg]

Hi,

On Mon, May 30, 2011 at 01:01:57PM +0200, Wolfgang Denk wrote:
> Dear Ankita Garg,
> 
> In message <20110530102030.GD18375 at in.ibm.com> you wrote:
> > 
> > I agree with the above. Its not the power consumed by u-boot that is of
> > concern. We want u-boot support in exporting additional information to
> > the kernel, regarding the memory hardware characteristics specific to
> > power management. For instance, if u-boot could inform the kernel about
> > the boundaries at which PASR is supported on the underlying platform,
> > that information could then be used by the kernel to exploit this
> > feature. Like, this information would be encapsulated in a device-tree
> > node maybe ?
> 
> I agree that is is a good idea to encode such information in the
> device tree.  U-Boot can also help to update memory related notes in
> the device tree, for example by inserting their actual physical
> addresses and sizes.
> 
> The rest, including information about memory power management
> properties of such nodes in the device tree, is of no concern to
> U-Boot and should just be passed on unchanged.
> 
> In my opinion it is therefore the responsibility of the creator of
> the device tree to provide a proper description of the hardware,
> including the memory power management information.
>

Ok, thats true. So I guess a better place would be the linux-arm-kernel
list to discuss about potential device-tree interface design.
Thanks Wolfgang !
 
-- 
Regards,
Ankita Garg (ankita at in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs,
Bangalore, India