How to do incremental builds?

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My workflow is:

  1. source ../pmbootstrap/envkernel.sh
    make <soc>_defconfig # Only once
  2. make -j<procNum>
  3. pmbootrap build --envkernel linux-postmarketos-<soc>
  4. pmbootstrap sideload linux-postmarketos-<soc> # You will need --install-key at the first
  5. reboot

You can build only a dtb with:
make qcom/msm8937-xiaomi-land.dtb
You can copy your devicetree to the boot partition /boot and reboot.
Check your extlinux config.

Or a driver
make drivers/gpu/drm/panel/panel-boe-himax8279d.o
For the driver i would recommend make a full kernel build first install it and after you can overwrite the module or unload/load it with rmmod and insmod.

If you port a device you can use:

  1. cat .output/arch/arm64/boot/Image.gz .output/arch/arm64/boot/dts/<soc>/<your dt> > Image.gz-dtb
  2. fastboot boot Image.gz-dtb
    If you get an initfs from existing pmos chroot you can boot the full system
    fastboot boot Image.gz-dtb initfs # --cmdline paramter useful for set necessary kernel or lk2nd related params
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