@Peacemaker,
If your goal is to run new kernel, then I think the best approach is to get new kernel working first, even with 1 SATA port. New u-boot is nice, but probably not necessary to boot new kernel.
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Overall I'm not quite happy with the patched Kernel 2.6:
But Krefs Oxnas Kernel works well with the .dts from the openwrt-oxnas-projekt, but only with one sata port.
So as I'd like to use both sata, and have not a clue how to activate the 2 ports ( just change the emmu form maxports form 1 to 2 dont work :-| ) or add the old sata driver to the 3.1X kernel. The kernel is jet not the right for my purpose.
If your goal is to run new kernel, then I think the best approach is to get new kernel working first, even with 1 SATA port. New u-boot is nice, but probably not necessary to boot new kernel.