Re: [PATCH 2/5] bootwrapper: Add CONFIG_DEVICE_TREE

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

On Apr 12, 2007, at 11:17 AM, Scott Wood wrote:

> Kumar Gala wrote:
>> On Apr 12, 2007, at 10:36 AM, Scott Wood wrote:
>>> Paul Mackerras wrote:
>>>
>>>> Hmmm, I'm not sure that I want to be asked about   
>>>> CONFIG_DEVICE_TREE on
>>>> *all* powerpc platforms...  Surely this option should depend on
>>>> something that says we're including support for a uBoot-able   
>>>> platform?
>>>
>>>
>>> That's how I originally had it, but I was asked to make it more   
>>> general.
>>>   One non-uboot usage is Mark Greer's "Add Makefile rule to wrap dts
>>> file in zImage" patch.
>>>
>>> What about a CONFIG_WANT_DEVICE_TREE that platforms can select if  
>>> they
>>> want to ask the user for a device tree?
>> Wouldn't we want this for all systems that don't have true OF?
>
> Not if there's a non-OF firmware that doesn't need to go through  
> the bootwrapper (such as modern u-boot).

I guess my intent with asking for the CONFIG_DEVICE_TREE to be more  
generic was to have it point to a .dts for the board/system in  
question.  The kernel proper wouldn't ever use this, but any other  
build mechanism could.

For example, I might have scripts outside of u-boot/kernel that build  
my images to flash into a board and they could parse .config to get  
the location of the .dts to create the dtb and produce my flash images.

- k