bluetooth - Bluetooth on Raspberry Pi Zero W, using buildroot

I'm trying to get the onboard Broadcom bluetooth working in a Buildroot 2017.08 built linux on the Raspberry Pi Zero W. It's not showing me the adapter. Bluetooth USB dongles do work.

Things I've already done:

Added rpi-bt-firmware
Added Bluez-tools and Bluez5-utils
Kernel compiled with all sorts of Bluetooth support
Loaded bluetooth modules: bluetooth, bnep, btbcm, hci_uart
rfkill list (shows no bluetooth devices)
rfkill unblock bluetooth (just in case)

After boot I'm manually starting bluetoothd followed by bluetoothctl. when I type "power on", "list" or "show" it does not give me any bluetooth controllers.

The hardware is working, on the same system I have Debian Jessie working fine with the bluetooth.

Also, given that USB bluetooth dongles work, I think the kernel is OK too.

What could possibly be the problem here??
Anything I could try to troubleshoot??
Anything I could install or add to make it work??

Anything is welcome at this point! :)

UPDATE

I have it working by running hciattach /dev/ttyAMA0 bcm43xx 921600 flow - at start-up. However, I have barely a clue what's going on here. Proper explanation will count as an answer.

I have also removed console=/dev/ttyAMA0 from the cmdline.txt, not sure though if that was necessary.

Bluetooth on Raspberry Pi Zero W, using buildroot

1 个答案: