konfig.nrf: Bluetooth Add SOC dependent BT_TX_PROCESSOR_STACK_SIZE

Values were derived from Thread Analyzer results.
Applying SoC-specific defaults here to avoid touching upstream Zephyr
files.
Applications can still override via prj.conf.

BT_TX_PROCESSOR_STACK_SIZE config was disabled for the
samples/applications that don't have enough RAM to support it.

Signed-off-by: Kyra Lengfeld <[email protected]>

Author: KyraLengfeld

Kconfig.nrf

@@ -121,6 +121,24 @@ config NRF_SECURITY_ENABLER
 	imply MBEDTLS_ENABLE_HEAP if BT_HOST_CRYPTO_PRNG || BT_ECC || BT_GATT_CACHING || BT_CRYPTO
 	depends on !SOC_NRF5340_CPUNET
 
+# Bluetooth TX processor thread stack Thread Analyzer measurements
+# Apply SoC-specific defaults here to avoid touching upstream Zephyr files.
+# Applications can still override via prj.conf.
+configdefault BT_TX_PROCESSOR_STACK_SIZE
+	# nRF52 variants
+	default 768 if SOC_NRF52840
+	default 696 if SOC_NRF52832
+	default 969 if SOC_NRF52833
+	# nRF53 (application core)
+	default 688 if SOC_NRF5340_CPUAPP
+	# nRF54H20 (application core)
+	default 624 if SOC_NRF54H20_CPUAPP
+	# nRF54L15 (application core)
+	default 856 if SOC_NRF54L15_CPUAPP
+	# nRF54L V10A / LM20A (currently application core EngA variants are used)
+	default 856 if SOC_NRF54LV10A_ENGA_CPUAPP
+	default 856 if SOC_NRF54LM20A_ENGA_CPUAPP
+
 if SOC_SERIES_BSIM_NRFXX && ENTROPY_GENERATOR
 config MBEDTLS_HEAP_SIZE
 	int

applications/ipc_radio/Kconfig

@@ -71,4 +71,9 @@ module = IPC_RADIO
 module-str = "ipc_radio"
 source "$(ZEPHYR_BASE)/subsys/logging/Kconfig.template.log_config"
 
+# RAM for this application for these boards is too few to use
+# the BT TX processor thread.
+configdefault BT_TX_PROCESSOR_THREAD
+	default n if BOARD_NRF52833DK_NRF52820 || BOARD_NRF52820DONGLE
+
 source "Kconfig.zephyr"

applications/nrf_desktop/Kconfig

@@ -16,5 +16,9 @@ rsource "Kconfig.defaults"
 endmenu
 
 menu "Zephyr Kernel"
+# RAM for this application for these boards is too few to use
+# the BT TX processor thread.
+configdefault BT_TX_PROCESSOR_THREAD
+	default n if BOARD_NRF52833DK_NRF52820 || BOARD_NRF52820DONGLE
 source "Kconfig.zephyr"
 endmenu

samples/bluetooth/direction_finding_central/Kconfig

@@ -0,0 +1,12 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# RAM for this application for this board is too few to use
+# the BT TX processor thread.
+configdefault BT_TX_PROCESSOR_THREAD
+	default n if BOARD_NRF52833DK_NRF52820
+
+source "Kconfig.zephyr"

samples/bluetooth/direction_finding_peripheral/Kconfig

@@ -0,0 +1,12 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# RAM for this application for this board is too few to use
+# the BT TX processor thread.
+configdefault BT_TX_PROCESSOR_THREAD
+	default n if BOARD_NRF52833DK_NRF52820
+
+source "Kconfig.zephyr"