How to generate a patch limited to MTD subsystem

[llandre]

I'm facing the following problem.
I'm working on custom hardware with kernel 2.6.15. I suspect I need to 
update the MTD subsystem with latest sources. How to do that without 
migrating to latest kernel? In other words I need to generate a patch 
from latest MTD code against MTD code included in v2.6.15 kernel. Is it 
possible? How?


TIA,
llandre

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