Add bootloader menu option

README.md

@@ -1,14 +1,15 @@
 # MiniCore
 [![Build Status](https://travis-ci.org/MCUdude/MiniCore.svg?branch=master)](https://travis-ci.org/MCUdude/MiniCore) [![MiniCore forum thread](https://img.shields.io/badge/support-forum-blue.svg)](https://forum.arduino.cc/index.php?topic=412070.0)  
 
-An Arduino core for the ATmega8, ATmega48, ATmega88, ATmega168 and ATmega328, all running a [custom version of Optiboot for increased functionality](#write-to-own-flash). This core requires at least Arduino IDE v1.6.2, where v1.6.5+ is recommended. <br/>
+An Arduino core for the ATmega8, ATmega48, ATmega88, ATmega168 and ATmega328, all running a [custom version of Optiboot for increased functionality](#write-to-own-flash). This core requires at least Arduino IDE v1.6.2, where v1.8.5+ is recommended. <br/>
 **This core gives you two extra IO pins if you're using the internal oscillator!** PB6 and PB7 is mapped to [Arduino pin 20 and 21](#pinout).<br/>
 If you're into "generic" AVR programming, I'm happy to tell you that all relevant keywords are being highlighted by the IDE through a separate keywords file. Make sure to test the [example files](https://github.com/MCUdude/MiniCore/tree/master/avr/libraries/AVR_examples/examples) (File > Examples > AVR C code examples). Try writing a register name, <i>DDRB</i> for instance, and see for yourself!
 
 
 # Table of contents
 * [Supported microcontrollers](#supported-microcontrollers)
 * [Supported clock frequencies](#supported-clock-frequencies)
+* [Bootloader option](#bootloader-option)
 * [BOD option](#bod-option)
 * [Link time optimization / LTO](#link-time-optimization--lto)
 * [Programmers](#programmers)
@@ -71,7 +72,14 @@ Millis() is not affected, only micros() and delay(). Micros() executes equally f
 <b>**</b> There might be some issues related to the internal oscillator. It's factory calibrated, but may be a little "off" depending on the calibration, ambient temperature and operating voltage. If uploading failes while using the 8 MHz internal oscillator you have three options:
 * Edit the baudrate line in the [boards.txt](https://github.com/MCUdude/MiniCore/blob/3ba977a7c6f948beff5a928d7f11a627282779e2/avr/boards.txt#L83) file, and choose either 115200, 57600, 38400 or 19200 baud.
 * Upload the code using a programmer (USBasp, USBtinyISP etc.) or skip the bootloader by holding down the shift key while clicking the "Upload" button
-* Use the 1 MHz option instead 
+* Use the 1 MHz option instead  
+
+
+## Bootloader option
+If your application doesn't need or require a bootloader for uploading code, you can choose to disable this.
+This free 512 bytes of the flash memory, which is significant if you're working with a small microcontroller such as ATmega8 or ATmega88.  
+
+Note that you need to select **Bootloader: "No"** and actually hit **Burn bootloader** in order to set the correct fuse bits. Now you're no longer able to upload using serial, until you select *Bootloader: "Yes"* and burn the bootloader again.
 
 
 ## BOD option
@@ -92,7 +100,7 @@ I encourage you to try the new LTO option and see how much smaller your code get
 
 
 ## Programmers
-Mini does not adds its own copies of all the standard programmers to the "Programmer" menu. Just select one of the stock programmers in the "Programmers" menu, and you're ready to "Burn Bootloader" or "Upload Using Programmer".
+MiniCore does not adds its own copies of all the standard programmers to the "Programmer" menu. Just select one of the stock programmers in the "Programmers" menu, and you're ready to "Burn Bootloader" or "Upload Using Programmer".
 
 Select your microcontroller in the boards menu, then select the clock frequency. You'll have to hit "Burn bootloader" in order to set the correct fuses and upload the correct bootloader. <br/>
 Make sure you connect an ISP programmer, and select the correct one in the "Programmers" menu. For time critical operations an external oscillator is recommended.
@@ -101,7 +109,7 @@ Make sure you connect an ISP programmer, and select the correct one in the "Prog
 ## Write to own flash
 MiniCore implements [@majekw](https://github.com/majekw) fork of Optiboot, which enables flash writing functionality within the running application. This means that content from e.g. a sensor can be stored in the flash memory directly, without the need of external memory. Flash memory is much faster than EEPROM, and can handle about 10 000 write cycles.  
 To enable this feature your original bootloader needs to be replaced by the new one. Simply hit "Burn Bootloader", and it's done!  
-Please check out the [Optiboot flasher example](https://github.com/MCUdude/MiniCore/tree/master/avr/libraries/Optiboot_flasher/examples/SerialReadWrite) for more info about how this feature works, and how you can try it on your MiniCore compatible microcontroller.
+Check out the [Optiboot flasher example](https://github.com/MCUdude/MiniCore/tree/master/avr/libraries/Optiboot_flasher/examples/SerialReadWrite) for more info about how this feature works, and how you can try it on your MiniCore compatible microcontroller.
 
 
 ## How to install