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
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