portentac33: add log uart

uart will be used by loader for logging when SHELL is not enabled

Author: pennam

variants/arduino_portenta_c33_r7fa6m5bh3cfc/arduino_portenta_c33_r7fa6m5bh3cfc.conf

@@ -10,7 +10,6 @@ CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n
 CONFIG_SERIAL=y
 CONFIG_UART_LINE_CTRL=y
 CONFIG_USBD_CDC_ACM_CLASS=y
-CONFIG_CDC_ACM_DTE_RATE_CALLBACK_SUPPORT=y
 CONFIG_USBD_CDC_ACM_LOG_LEVEL_ERR=y
 CONFIG_UDC_DRIVER_LOG_LEVEL_ERR=y
 CONFIG_USBD_LOG_LEVEL_ERR=y
@@ -24,12 +23,16 @@ CONFIG_ARM_MPU=n
 CONFIG_CPP=n
 CONFIG_SHELL=n
 
+CONFIG_LOG_BACKEND_UART=y
+CONFIG_LOG_BACKEND_UART_AUTOSTART=n
+CONFIG_LOG_DEFAULT_LEVEL=2
+
 CONFIG_MAIN_STACK_SIZE=32768
 CONFIG_LLEXT_HEAP_SIZE=128
 CONFIG_HEAP_MEM_POOL_SIZE=32768
 CONFIG_ISR_STACK_SIZE=8192
-CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=8192
-CONFIG_IDLE_STACK_SIZE=8192
+#CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=8192
+#CONFIG_IDLE_STACK_SIZE=8192
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192
 
 CONFIG_ADC=y

variants/arduino_portenta_c33_r7fa6m5bh3cfc/arduino_portenta_c33_r7fa6m5bh3cfc.overlay

@@ -5,6 +5,17 @@
 	};
 };
 
+/{
+	chosen {
+		zephyr,log-uart = &log_uarts;
+	};
+
+	log_uarts: log_uarts {
+		compatible = "zephyr,log-uart";
+		uarts = <&uart9 &board_cdc_acm_uart>;
+	};
+};
+
 &flash0 {
 	partitions {
 		mcuboot: partition@0 {