Steps for building kernel E2303 M4 Aqua

Good morning. I'm trying to build the kernel for the M4 aqua, but although sony didn't include it in the guides for doing so, I can see the files inside the tulip in sony's github repository. Then, I guess that it's possible to build a kernel from sony's sources. If anyone did so, could please post and briefly describe the steps? More concretely, the line with the arguments for mkbootimg (or the necessary tool). Thanks in advance

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