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The GPL for k4 and k5 u-boot is standalone, so no denx or freescale dependencies. I built it, but it is stripped down to fit smaller mmc. The k5 (touch) u-boot is bigger and supports more devices including the k4. I used that in my KindleSelectBoot. Depending on available size, perhaps you can just replace the k3 u-boot image in the mmc with a k4 or k5 u-boot image. You could test with AdvanceToolKit (K3 version of MfgTool) to download and run a k5 uboot image. K3 Magic Key = Vol-.
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