When flashing the chip with a build from the samples/bluetooth/hci_uart via west build -b nrf52840dk/nrf52840 samples/bluetooth/hci_uart --pristine and west flash off the current main of sdk-zephyr, a btattach command from a linux host connected to the Zephyr device over UART hangs indefinitely:
btattach -B /dev/ttyMSM` -S 1000000 -P h4
Attaching Primary controller to /dev/ttyMSM2
Switched line discipline from 0 to 15
= New Index: 00:00:00:00:00:00 (Primary,UART,hci1) #0 [hci1] 4311.006931
= Open Index: 00:00:00:00:00:00 [hci1] 4311.007519
< HCI Command: Reset (0x03|0x0003) plen 0 #1 [hci1] 4311.007671
Device index 1 attached
The bluez version is 5.54, zephyr-sdk is the latest.
Looking at the backtrace on the device via gdb shows the CPU as idle, and no attempts to access the UART are seen.
When attempting to disable the config value CONFIG_BT_CTLR as suggested here, the build fails with the below error. What must be done to enable HCI UART support on the Zephyr device?
-- Zephyr version: 4.0.0-rc2 (/Users/samantha.cho/clones/zephyrproject/zephyr), build: v4.0.0-rc2-53-gb9fc4cc4151f [139/144] Linking C executable zephyr/zephyr_pre0.elf FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map /Users/samantha.cho/clones/zephyrproject/build/zephyr/zephyr_pre0.map : && ccache /Users/samantha.cho/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc -gdwarf-4 -gdwarf-4 zephyr/CMakeFiles/zephyr_pre0.dir/misc/empty_file.c.obj -o zephyr/zephyr_pre0.elf zephyr/CMakeFiles/offsets.dir/./arch/arm/core/offsets/offsets.c.obj -T zephyr/linker_zephyr_pre0.cmd -Wl,-Map=/Users/samantha.cho/clones/zephyrproject/build/zephyr/zephyr_pre0.map -Wl,--whole-archive app/libapp.a zephyr/libzephyr.a zephyr/arch/common/libarch__common.a zephyr/arch/arch/arm/core/libarch__arm__core.a zephyr/arch/arch/arm/core/cortex_m/libarch__arm__core__cortex_m.a zephyr/arch/arch/arm/core/mpu/libarch__arm__core__mpu.a zephyr/lib/libc/picolibc/liblib__libc__picolibc.a zephyr/lib/libc/common/liblib__libc__common.a zephyr/lib/net_buf/liblib__net_buf.a zephyr/soc/soc/nrf52840/libsoc__nordic.a zephyr/subsys/bluetooth/common/libsubsys__bluetooth__common.a zephyr/subsys/bluetooth/host/libsubsys__bluetooth__host.a zephyr/drivers/clock_control/libdrivers__clock_control.a zephyr/drivers/gpio/libdrivers__gpio.a zephyr/drivers/pinctrl/libdrivers__pinctrl.a zephyr/drivers/serial/libdrivers__serial.a zephyr/drivers/timer/libdrivers__timer.a modules/hal_nordic/nrfx/libmodules__hal_nordic__nrfx.a modules/segger/libmodules__segger.a -Wl,--no-whole-archive zephyr/kernel/libkernel.a -L/Users/samantha.cho/clones/zephyrproject/build/zephyr zephyr/arch/common/libisr_tables.a -mcpu=cortex-m4 -mthumb -mabi=aapcs -mfp16-format=ieee -mtp=soft -fuse-ld=bfd -Wl,--gc-sections -Wl,--build-id=none -Wl,--sort-common=descending -Wl,--sort-section=alignment -Wl,-u,_OffsetAbsSyms -Wl,-u,_ConfigAbsSyms -nostdlib -static -Wl,-X -Wl,-N -Wl,--orphan-handling=warn -Wl,-no-pie -specs=picolibc.specs -DPICOLIBC_LONG_LONG_PRINTF_SCANF -L"/Users/samantha.cho/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/thumb/v7e-m/nofp" -lc -lgcc && cd /Users/samantha.cho/clones/zephyrproject/build/zephyr && /opt/homebrew/Cellar/cmake/3.30.5/bin/cmake -E true /Users/samantha.cho/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/subsys/bluetooth/host/libsubsys__bluetooth__host.a(hci_raw.c.obj):/Users/samantha.cho/clones/zephyrproject/zephyr/subsys/bluetooth/host/hci_raw.c:60: undefined reference to `__device_dts_ord_133' collect2: error: ld returned 1 exit status ninja: build stopped: subcommand failed.