Ad How it works section and small content fixes

Author: marqdevx

content/hardware/04.pro/boards/portenta-x8/tutorials/uploading-sketches-m4/content.md

@@ -4,9 +4,8 @@ description: 'This tutorial will show how to upload Arduino sketches on the M4 p
 difficulty: medium
 beta: true
 tags:
-  - Bootloader
   - Firmware
-  - Core
+  - M4
 author: 'Pablo Marquínez'
 hardware:
   - hardware/04.pro/boards/portenta-x8
@@ -17,7 +16,7 @@ software:
 ---
 
 ## Overview
-This tutorial will explain how to upload a standard Arduino sketch to your portenta X8's M4.
+This tutorial will explain how to upload a standard Arduino sketch to your Portenta X8's M4.
 
 ## Goals
 - Use the Arduino IDE to compile and upload.
@@ -67,6 +66,14 @@ adb push <sketchBinaryPath> /tmp/arduino/m4-user-sketch.elf
 
 ![ADB upload with a terminal](assets/x8-terminal-ADB-push.png)
 
+## How it works?
+The Portenta X8 has some services that once the sketch has been pushed to the required folder, if it detects changes the device will flash the M4 after that happened!
+
+This work thanks to the following services:
+* monitor-m4-elf-file.service: this service monitors the directory `/tmp/arduino/m4-user-sketch.elf` each time it detects a new file it will proceed to flash the M4 using the tool `openOCD` and providing the sketch that has been pushed.
+* android-tools-adbd.service: responsible of generating the needed interfaces for the different types of usb gadgets.
+* create-docker-envfile.service: Controls if the device has been plugged for example in some carrier and makes the info available at `/var/run/arduino_hw_info.env` and is meant to be used by the ´docker containers´.
+
 ## Conclusion
 You now have access to the M4 processor, so for example you are able to connect an I<sup>2</sup>C sensor and interact with it and the Arduino X8 Linux side.