Re: removing get_immrbase()??

[Kumar Gala <galak@kernel.crashing.org>]

On Apr 22, 2009, at 4:38 PM, Scott Wood wrote:

> Kumar Gala wrote:
>> I disagree.  If you update your kernel you should update your  
>> device tree (thus we have .dts in the kernel tree and not somewhere  
>> else).
>
> No.  The device tree is a means to pass information from the  
> firmware to the kernel.  It is part of the firmware.  That the  
> repository of trees is in the Linux kernel for any boards which are  
> not including the tree inside a bootwrapper is a historical accident.

I think its a point of view argument.  I don't agree its part of the  
firmware, at least not part of the firmware we use (u-boot).

> Updating the dtb with the kernel just shifts the risk of  
> incompatibility to interactions between the firmware and the dtb.   
> The same backwards compatibility considerations when making kernel  
> changes that depend on firmware changes should be made when making  
> kernel changes that depend on dts changes.

As I told Timur, I'm speaking of addition of new nodes and code that  
parses and expect those nodes to be there.

- k