Bluetooth not working, PI 4 *SOLVED*

[JumboAg]

I've got a raspberry pi 4B successfully running Gentoo using raspberrpi-firmware, raspberrypi-image and raspberrypi-sources. Btattach threw no errors, ttyAMA0 is present, nothing jumping out at me in any logs. Bluetooth *seems* to be running but it cant find anything.

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pi@gentoopi /etc/init.d $ ls -la /dev/ttyAMA0
crw--w---- 1 root tty 204, 64 Oct 28 11:27 /dev/ttyAMA0

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pi@gentoopi /etc/init.d $ dmesg|grep -i bluetooth
[  945.781584] Bluetooth: Core ver 2.22
[  945.781682] NET: Registered PF_BLUETOOTH protocol family
[  945.781690] Bluetooth: HCI device and connection manager initialized
[  945.781708] Bluetooth: HCI socket layer initialized
[  945.781725] Bluetooth: L2CAP socket layer initialized
[  945.781744] Bluetooth: SCO socket layer initialized
[  974.304445] Bluetooth: HCI UART driver ver 2.3
[  974.304471] Bluetooth: HCI UART protocol H4 registered
[  974.304551] Bluetooth: HCI UART protocol Three-wire (H5) registered
[  974.304824] Bluetooth: HCI UART protocol Broadcom registered
[  974.422932] Bluetooth: hci0: BCM: chip id 107
[  974.425176] Bluetooth: hci0: BCM: features 0x2f
[  974.448330] Bluetooth: hci0: BCM4345C0
[  974.448351] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0000
[  974.455423] Bluetooth: hci0: BCM4345C0 'brcm/BCM4345C0.hcd' Patch
[  980.860246] Bluetooth: hci0: BCM43455 37.4MHz Raspberry Pi 3+-0187
[  980.860280] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0370

Does the 4 use a different Chip? Am I missing a required firmware?

Possibly related: I segfault when I run bluetoothctl:

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pi@gentoopi /etc/init.d $ sudo bluetoothctl
Waiting to connect to bluetoothd...Segmentation fault

[alamahant]

Hi
What is your

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uname -r

?

[NeddySeagoon]

JumboAg,

Does the wifi work?

Wifi and Bluetooth are in the same chip and share some firmware files.
They both use the same antenna, Tx and Rx too.

They do have different data interfaces. Wifi is on mmc1 and bluetooth on the serial part.
Bluetooth also requires that firmware be loaded over the serial port.

[JumboAg]

yep, the wifi is working just fine. Bluetooth just isn't finding any BT devices

[NeddySeagoon]

JumboAg,

What firmware file do you load over the serial port and how do you load it?

[JumboAg]

This is the firmware I'm using: BCM4345C0.hcd

I'm letting the firmware itself autoload

I created a btattach script and put it in init.d and the default runlevel.

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pi@gentoopi /etc/init.d $ cat btattach
#!/sbin/openrc-run

command="/usr/bin/btattach"
command_args="-B /dev/ttyAMA0 -P bcm -S 3000000"
command_background=true
pidfile="/run/btattach.pid"

depend() {
        after coldplug hotplug modules
        need localmount
}

[NeddySeagoon]

JumboAg,

This is going back a bit. Its probably Pi3 but the method my be useful.
It might not too, things keep changing.

My

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/mnt/cdrom/etc/local.d/bluetooth.start

contains

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 #!/bin/bash

# Having openrc start the bluetooth service is required
# but not sufficient to have Raspberry Pi bluetooth working
# bluez needs some patches they are in /etc/portage/patches
# so if you want to rebuild bluez, you can :) 

# Bluetooth is attached to /dev/ttyAMA0 so attach it and 
# load the firmware 
/usr/bin/hciattach /dev/ttyAMA0 bcm43xx 921600 noflow - 

# thats enough to have it work for some things.

# for sound we need bluealsa or pulseaudio
# pulseaudio reminds me of systemd - its not tested.
bluealsa &

That /usr/bin/hciattach looks very Pi3. The bcm43xx firmware and the 921600 baud rate, in particular.

My Pi4s are all in metal (Faraday cage) enclosures, for passive cooling, so I can't use WiFi or Bluetooth.

[JumboAg]

#@%@#% #$@#%@%#@$ % #!@$%%#$@% !!!

Sigh... found it. Typo in my config.txt file. Didnt throw any errors but wouldnt start BT correctly until I fixed.


Wrong line: dtparm=krnbt=on
right line: dtparam=krnbt=on


The hciattach/btattach is not required with the 4b. Just starting the bluetooth service is sufficient.