Re: Is there a document for setting up Bluetooth on a Raspberry Pi 3B?

[Rui-Xiang Guo <rxg%lavabit.com@localhost>]

On Sun, May 19, 2024 at 03:48:40PM +0800, Christopher Hall wrote:
> Hello port-arm,
> 
> So far I have not found much information about this.
> 
> I see a commented out line in /etc/bluetooth/btattach.conf referencing
> /dev/dplcom0, which I have uncommented. I also added a device "speaker"
> along with its address for testing.

This config file is for setting a bluetooth device as a serial device.

> I did find a reference to needing the file
> /libdata/firmware/bcm43xx/BCM43430A1.hcd which I found and have
> installed.

On my rpi3b+, the device is BCM43455 and firmware is brcmfmac43455-sdio.bin
which is shared with bwfm wireless driver.
[     5.059198] bwfm0: Found Firmware file: brcmfmac43455-sdio.bin
[     5.099202] bwfm0: NVRAM file default:    brcmfmac43455-sdio.txt
[     5.099202] bwfm0: NVRAM file model-spec: brcmfmac43455-sdio.raspberrypi,3-model-b-plus.txt
[     5.099202] bwfm0: Found NVRAM file: brcmfmac43455-sdio.raspberrypi,3-model-b-plus.txt
[     5.099202] bwfm0: CLM file default:    brcmfmac43455-sdio.clm_blob
[     5.099202] bwfm0: CLM file model-spec: brcmfmac43455-sdio.raspberrypi,3-model-b-plus.clm_blob
[     7.159408] bwfm0: CHIPACTIVE

> The Gentoo wiki also suggested adding dtparam=krnbt=on to
> /boot/config.txt but this had no effect.
> 
> This is NetBSD 10.0 arm64 image, a few boot message lines:
>   simplebus0 at armfdt0: Raspberry Pi 3 Model B Rev 1.2
>   plcom0 at simplebus1: ARM PL011 UART
>   plcom0: txfifo disabled
>   plcom0: interrupting on icu irq 57
> 
> When the rc.d/bluetooth runs, it shows:
>   attaching Bluetooth controller to dplcom0
>   btattach: bth5: Device not configured
>   configuring Bluetooth controllers:.
>   starting Bluetooth Link Key/PIN Code manager
>   attaching Bluetooth HSET service from "speaker"
>   btdevctl: sbt0: Device not configured
>   attaching Bluetooth HSET service from "speaker"
>   btdevctl: ubt0: Device not configured
>   starting Bluetooth Service Discovery server
> 
> 
> I find man pages for ubt and sbt, but nothing about bth.
> also "btconfig" command returns nothing, 

I think there is no suitable bluetooth driver for bultin BCM43455/BCM43438.
However, you may try the bluetooth usb dongle, such as:
[     3.990736] ubt0 at uhub2 port 2
[     3.990736] ubt0: i.Tech Dynamic (0x13dd) BlueCON U2 (0x0001), rev 2.00/19.58, addr 4
Then see the guide:
https://www.netbsd.org/docs/guide/en/chap-bluetooth.html

-rxg