And yeah, for my own stuff, it's the kindle5 config that's appropriate for the K4, the K3 (kindle) one is a monstrosity requiring a bit of hoop-jumping even when targeting the K3
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That said, I only ever compiled userland stuff with those, so, no guarantee that it'll actually work, but on the paper it's 'better'
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If your kernel is trying to load the default modules, and not those you built yourself, then a clash in GCC version used to build the two might cause an issue. OTOH, I can't recall the TC used by Amazon for the K4, but that should be easy to track down.
@knc1: I'm still seeing active dev on ct-ng :?