How can i only build rootfile system i want to use my kernel

i port openwrt to my dev board ,so i want use openwrt but include kernel

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.... include A kernel, or YOUR kernel ?

i just use my kernel and openwrt rootfs,but i dont know how to build rootfs. my board not support in openwrt

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check the configurations for supported devices, using a separate rootfs and kernel, like x86.

my board is arm device . supported devices have on of like x86?

What I'm saying is, use the x86 target to see how the image is generated, then adapt the same for your arch.

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i try and thank you