问题
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.
回答1:
hciattach attaches serial HCI devices via UART to Bluez stack https://www.systutorials.com/docs/linux/man/8-hciattach/.
In your case the serial Broadcom HCI adapter is at /dev/ttyAMA0, so the command your run attaches it to Bluez as a bcm43xx HCI adapter.
Its probably done the same in your Debian Jessie setup.
来源：https://stackoverflow.com/questions/46707175/bluetooth-on-raspberry-pi-zero-w-using-buildroot