arduino · iabdalkader · Nov 26, 2025 · Nov 25, 2025 · Dec 1, 2025 · Dec 1, 2025
diff --git a/extra/build.sh b/extra/build.sh
@@ -51,6 +51,11 @@ else
 	args="$*"
 fi
 
+# Check for debug flag and append
+if [ x$2 == x"--debug" ]; then
+	args="$args -- -DEXTRA_CONF_FILE=../extra/debug.conf"
+fi
+
 echo
 echo "Build target: $target $args"
 

diff --git a/extra/debug.conf b/extra/debug.conf
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: Apache-2.0
+# Debug configuration for Arduino Core Zephyr
+
+# Enable debug mode
+CONFIG_DEBUG=y
+
+# Enable assertions
+CONFIG_ASSERT=y
+#CONFIG_ASSERT_VERBOSE=y
+
+# Enable stack overflow detection
+CONFIG_STACK_SENTINEL=y
+CONFIG_STACK_CANARIES=y
+
+# Enable thread monitoring and debugging
+CONFIG_THREAD_MONITOR=y
+CONFIG_THREAD_NAME=y
+CONFIG_DEBUG_THREAD_INFO=y
+
+# Disable compiler optimizations
+#CONFIG_DEBUG_OPTIMIZATIONS=y
+
+# Enable and configure the shell
+CONFIG_SHELL=y
+#CONFIG_NET_SHELL=y
+#CONFIG_NET_L2_WIFI_SHELL=y
+CONFIG_SHELL_STACK_SIZE=8192
+
+# Enable runtime statistics
+CONFIG_SYS_HEAP_RUNTIME_STATS=y
+CONFIG_THREAD_RUNTIME_STATS=y
diff --git a/loader/CMakeLists.txt b/loader/CMakeLists.txt
@@ -16,6 +16,20 @@ project(app LANGUAGES C CXX)
 
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/blobs)
 
+# Memory region relocation based on Kconfig
+# Relocate LLEXT heap if region specified
+if(NOT "${CONFIG_LLEXT_HEAP_REGION}" STREQUAL "")
+    zephyr_code_relocate(FILES ${ZEPHYR_BASE}/subsys/llext/llext_mem.c
+                         LOCATION ${CONFIG_LLEXT_HEAP_REGION}_BSS_NOINIT)
+endif()
+
+# Relocate main stack if region specified
+if(NOT "${CONFIG_MAIN_STACK_REGION}" STREQUAL "")
+    zephyr_code_relocate(FILES ${ZEPHYR_BASE}/kernel/init.c
+                         LOCATION ${CONFIG_MAIN_STACK_REGION}_BSS_NOINIT)
+endif()
+
+
 # for USB device stack NEXT
 target_sources_ifdef(CONFIG_USB_DEVICE_STACK_NEXT app PRIVATE
     ${CMAKE_CURRENT_LIST_DIR}/../cores/arduino/usb_device_descriptor.c

diff --git a/loader/Kconfig b/loader/Kconfig
@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2025 Arduino
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+source "Kconfig.zephyr"
+
+config LLEXT_HEAP_REGION
+	string "LLEXT heap memory region"
+	depends on CODE_DATA_RELOCATION
+	help
+	  Specify the memory region for LLEXT heap.
+
+config MAIN_STACK_REGION
+	string "Main stack memory region"
+	depends on CODE_DATA_RELOCATION
+	help
+	  Specify the memory region for main stack.
diff --git a/loader/fixups.c b/loader/fixups.c
@@ -1,6 +1,13 @@
 #include <cmsis_core.h>
 #include <zephyr/init.h>
 
+#ifndef CONFIG_CPP
+void __cxa_pure_virtual() {
+	while (1)
+		;
+}
+#endif
+
 int disable_mpu_rasr_xn(void) {
 	uint32_t index;
 	/* Kept the max index as 8(irrespective of soc) because the sram

diff --git a/loader/llext_exports.c b/loader/llext_exports.c
@@ -82,9 +82,14 @@ EXPORT_SYMBOL(usb_enable);
 EXPORT_SYMBOL(usb_disable);
 #endif
 
+#if CONFIG_LOG
 EXPORT_SYMBOL(z_log_msg_runtime_vcreate);
+FORCE_EXPORT_SYM(log_const_sketch)
+#endif
 
+#if defined(CONFIG_LOG_RUNTIME_FILTERING)
 FORCE_EXPORT_SYM(log_dynamic_sketch)
+#endif
 
 #if defined(CONFIG_NETWORKING)
 FORCE_EXPORT_SYM(net_if_foreach);

diff --git a/variants/arduino_giga_r1_stm32h747xx_m7/arduino_giga_r1_stm32h747xx_m7.conf b/variants/arduino_giga_r1_stm32h747xx_m7/arduino_giga_r1_stm32h747xx_m7.conf
@@ -16,8 +16,10 @@ CONFIG_SHELL_STACK_SIZE=32768
 CONFIG_MAIN_STACK_SIZE=32768
 CONFIG_LLEXT_HEAP_SIZE=128
 
-CONFIG_FPU=y
+CONFIG_CPP=n
+CONFIG_SHELL=n
 
+CONFIG_FPU=y
 CONFIG_ADC=y
 CONFIG_DAC=y
 CONFIG_PWM=y
@@ -39,13 +41,12 @@ CONFIG_MBEDTLS=y
 CONFIG_MBEDTLS_BUILTIN=y
 CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
 CONFIG_MBEDTLS_ENABLE_HEAP=y
-CONFIG_MBEDTLS_HEAP_SIZE=60000
+CONFIG_MBEDTLS_HEAP_SIZE=80000
 CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=7168
 CONFIG_MBEDTLS_HASH_ALL_ENABLED=y
 CONFIG_MBEDTLS_CMAC=y
 
 CONFIG_VIDEO=y
-CONFIG_VIDEO_LOG_LEVEL_DBG=y
 CONFIG_VIDEO_STM32_DCMI=y
 CONFIG_VIDEO_BUFFER_POOL_NUM_MAX=3
 CONFIG_VIDEO_BUFFER_POOL_SZ_MAX=614400
@@ -134,7 +135,4 @@ CONFIG_DNS_SERVER1="8.8.8.8"
 CONFIG_NET_CONFIG_AUTO_INIT=n
 CONFIG_NET_CONNECTION_MANAGER=y
 #CONFIG_WIFI_NM_MAX_MANAGED_INTERFACES=2
-
-CONFIG_NET_SHELL=y
 CONFIG_NET_L2_ETHERNET_MGMT=y
-CONFIG_NET_L2_WIFI_SHELL=y
diff --git a/variants/arduino_portenta_c33_r7fa6m5bh3cfc/arduino_portenta_c33_r7fa6m5bh3cfc.conf b/variants/arduino_portenta_c33_r7fa6m5bh3cfc/arduino_portenta_c33_r7fa6m5bh3cfc.conf
@@ -18,11 +18,12 @@ CONFIG_USBD_LOG_LEVEL_ERR=y
 CONFIG_LLEXT_STORAGE_WRITABLE=n
 
 CONFIG_FPU=y
-
 CONFIG_USERSPACE=n
 CONFIG_ARM_MPU=n
 
-CONFIG_SHELL_STACK_SIZE=8192
+CONFIG_CPP=n
+CONFIG_SHELL=n
+
 CONFIG_MAIN_STACK_SIZE=32768
 CONFIG_LLEXT_HEAP_SIZE=128
 CONFIG_HEAP_MEM_POOL_SIZE=32768
@@ -34,8 +35,6 @@ CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192
 CONFIG_ADC=y
 CONFIG_PWM=y
 
-CONFIG_NET_CORE_LOG_LEVEL_DBG=y
-
 CONFIG_NETWORKING=y
 CONFIG_NET_IPV6=n
 CONFIG_NET_IPV4=y
@@ -74,7 +73,7 @@ CONFIG_MBEDTLS=y
 CONFIG_MBEDTLS_BUILTIN=y
 CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
 CONFIG_MBEDTLS_ENABLE_HEAP=y
-CONFIG_MBEDTLS_HEAP_SIZE=60000
+CONFIG_MBEDTLS_HEAP_SIZE=80000
 CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=7168
 CONFIG_MBEDTLS_HASH_ALL_ENABLED=y
 CONFIG_MBEDTLS_CMAC=y
@@ -85,7 +84,6 @@ CONFIG_NANOPB=y
 CONFIG_NET_CONFIG_AUTO_INIT=n
 CONFIG_NET_CONNECTION_MANAGER=y
 CONFIG_WIFI_NM_MAX_MANAGED_INTERFACES=2
-CONFIG_NET_L2_WIFI_SHELL=y
 CONFIG_NET_MGMT_EVENT_QUEUE_SIZE=32
 
 CONFIG_NET_IF_MAX_IPV4_COUNT=3

diff --git a/variants/arduino_portenta_h7_stm32h747xx_m7/arduino_portenta_h7_stm32h747xx_m7.conf b/variants/arduino_portenta_h7_stm32h747xx_m7/arduino_portenta_h7_stm32h747xx_m7.conf
@@ -10,9 +10,12 @@ CONFIG_UART_LINE_CTRL=y
 CONFIG_CDC_ACM_DTE_RATE_CALLBACK_SUPPORT=y
 
 CONFIG_LLEXT_STORAGE_WRITABLE=n
-
 CONFIG_SHARED_MULTI_HEAP=y
-CONFIG_HEAP_MEM_POOL_SIZE=65536
+CONFIG_HEAP_MEM_POOL_SIZE=32768
+CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=-1
+
+CONFIG_CPP=n
+CONFIG_SHELL=n
 
 CONFIG_FPU=y
 CONFIG_ICACHE=y
@@ -23,10 +26,13 @@ CONFIG_USERSPACE=n
 CONFIG_ARM_MPU=y
 CONFIG_MAX_THREAD_BYTES=4
 
-CONFIG_SHELL_STACK_SIZE=32768
 CONFIG_MAIN_STACK_SIZE=32768
 CONFIG_LLEXT_HEAP_SIZE=128
 
+CONFIG_CODE_DATA_RELOCATION=y
+CONFIG_MAIN_STACK_REGION="DTCM"
+CONFIG_LLEXT_HEAP_REGION="SRAM2"
+
 CONFIG_ADC=y
 CONFIG_PWM=y
 CONFIG_DMA=y
@@ -40,13 +46,10 @@ CONFIG_SDHC_INIT_PRIORITY=75
 CONFIG_SDIO_STACK=y
 CONFIG_CYW4343W=y
 CONFIG_WIFI=y
-CONFIG_NET_L2_WIFI_SHELL=y
 
 CONFIG_AIROC_WIFI_CUSTOM=y
 CONFIG_STM32_MEMMAP=y
 
-CONFIG_NET_CORE_LOG_LEVEL_DBG=y
-
 CONFIG_NETWORKING=y
 CONFIG_NET_IPV6=n
 CONFIG_NET_IPV4=y
@@ -58,8 +61,6 @@ CONFIG_DNS_RESOLVER=y
 CONFIG_DNS_SERVER_IP_ADDRESSES=y
 CONFIG_DNS_SERVER1="8.8.8.8"
 
-CONFIG_INIT_STACKS=y
-
 CONFIG_NET_SOCKETS=y
 CONFIG_NET_SOCKETS_NET_MGMT=y
 CONFIG_NET_SOCKETS_SOCKOPT_TLS=y
@@ -82,13 +83,12 @@ CONFIG_MBEDTLS=y
 CONFIG_MBEDTLS_BUILTIN=y
 CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
 CONFIG_MBEDTLS_ENABLE_HEAP=y
-CONFIG_MBEDTLS_HEAP_SIZE=60000
+CONFIG_MBEDTLS_HEAP_SIZE=80000
 CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=7168
 CONFIG_MBEDTLS_HASH_ALL_ENABLED=y
 CONFIG_MBEDTLS_CMAC=y
 
 CONFIG_VIDEO=y
-CONFIG_VIDEO_LOG_LEVEL_DBG=y
 CONFIG_VIDEO_STM32_DCMI=y
 CONFIG_VIDEO_BUFFER_POOL_NUM_MAX=3
 CONFIG_VIDEO_BUFFER_POOL_SZ_MAX=614400