Hikey linux kernel android-hikey-linaro-4.9 bluetooth doesn't work

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#1

Hi,

I follow instruction on https://source.android.com/source/devices to get linux kernel android-hikey-linaro-4.9.
After build success, I replace hi6220-hikey.dtb-4.9 and Image-dtb-4.9, generate android-8.0.0_r4 boot.img and system.img.
After burning *.img successfully, hikey boot up android 8.0 but bluetooth doesn’t work.

The commit id of android-hikey-linaro-4.9 I used is
8f29dcde86673f92fd9269a8cc72fb10507d0c67

Does anyone have any idea about this problem?