[forty]

Rebasing (possibly shitty) patches from the SBC vendor to a recent kernel can be non trivial in my experience (as someone who have 0 knowledge of the Linux kernel code, so I'm a good baseline to define what's trivial ^^). And yes most vendors are will ship one working kernel source and forget about it forever right after :) even vendors that are not the worse depend on drivers that are provided by the SoC vendor, and might be stuck because rebasing a GPU driver might even be hard for them I guess.