Migrating XO-1.75 to device tree - upgrade considerations

[James Cameron]

On Tue, Aug 21, 2012 at 12:04:04PM -0600, Daniel Drake wrote:
> 2. Append the XO-1.75 device tree to the kernel image.

We also hope to boot this same kernel on other hardware, so it might
be necessary to include multiple device trees in this kernel.

> This is my favourite option - while we would have to duplicate the DT
> (once in the firmware, once in the kernel), at least they can be
> direct copies rather than two different approaches to maintain.
> 
> (can the kernel be made to use this only when a "good DT" is
> unavailable? Maybe the definition of "good DT" is hard to define - I'm
> referring to the fact that we already ship a DT, but not one that can
> be used to get the system on its feet in the absence of a board
> file)

We might also version the device trees, so that "good" is easier to
define.

-- 
James Cameron
http://quozl.linux.org.au/