HCI Driver fails - bt_hci_driver: Endpoint binding failed with -11

[Nyameaama]

Hello, Im in the middle of a custom board bringup and I am attempting to get Bluetooth GATT server working. I have tested the bluetooth code using the nrf5340dk board files and it works perfectly.  However, when I am having issues with the bluetooth on my custom board definitions. The hci_rpmsg_subimage flashes the network core but I just don't know what the problem is. I've attached the project files. Could you help me?

custom_board_ble.zip

[helsing]

Hi Nyameaama,

Try adding CONFIG_BT_RPC_STACK=y tp prj.conf and do a pristine build.

The same error is reported in this ticket:  HCI Driver open failed - NRF5340 .

Regarding '-11', this seems to be a timeout:

Either the netcore did not respond or it was the busy doing something.

[Nyameaama]

I still have the same problem with the aforementioned changes and I performed a pristine build:

[00:00:01.003,631] <err> bt_hci_driver: Endpoint binding failed with -11
[00:00:01.003,753] <err> bt_hci_core: HCI driver open failed (-11)
[00:00:01.003,814] <err> BLE_GATT_SERVER: Bluetooth init failed (err -11)

[Nyameaama]

Is it possible for you to test on your end to make sure everything is okay on my end?

[Hung Bui]

Hi Nyameaama, 

I'm taking over the ticket from Håkon. 
Could you let me know which SDK you are testing with ? 

I tried here on a DK and it seems to have the the same problem. I assume you were testing on a nRF53DK  (with your board files) and saw the same problem when testing with your board  ? 

I also tried to build your code with the nRF53 DK board file but it also didn't work. 

I'm not so sure what exactly cause the problem. It's hard to tell because there quite a lot has been changed in your custom board files. 

But my suggestion is to try testing with very simple BLE sample. Make sure it works fine on nRF53DK then try testing with your board files. 
If it doesn't work, try clone the nRF53 DK board configuration to your board files. After that try to remove the stuff that you don't use to match with your current board files and check if it still work at each step. 

I did test flashing the app core with simple application (peripheral_uart) and it worked. So most likely the network core is fine. It's something with the app core that having issue with hci_driver.