test: use memory mapped address if CONFIG_LLEXT_STORAGE_WRITABLE=n

Author: facchinm

loader/boards/arduino_giga_r1_m7.conf

@@ -9,6 +9,8 @@ CONFIG_USB_CDC_ACM_RINGBUF_SIZE=512
 CONFIG_UART_LINE_CTRL=y
 CONFIG_CDC_ACM_DTE_RATE_CALLBACK_SUPPORT=y
 
+CONFIG_LLEXT_STORAGE_WRITABLE=n
+
 CONFIG_FPU=y
 
 CONFIG_ADC=y

loader/main.c

@@ -68,7 +68,9 @@ static int loader(const struct shell *sh)
 		return rc;
 	}
 #else
-	uint32_t offset = FIXED_PARTITION_OFFSET(user_sketch);
+	// Assuming the sketch is stored in the same flash device as the loader
+	// uint32_t offset =  DT_REG_ADDR(DT_CHOSEN(zephyr_flash)) + DT_REG_ADDR(DT_NODELABEL(user_sketch));
+	uint32_t offset =  DT_REG_ADDR(DT_GPARENT(DT_NODELABEL(user_sketch))) + DT_REG_ADDR(DT_NODELABEL(user_sketch));
 	uint8_t* sketch_buf = (uint8_t*)(offset+header_len);
 #endif