+AVR Boot section size are defined by setting **BOOTSZ** fuse in fact. Consult with your MCU datasheet.\r
+Note that **Word**(2 bytes) size and address are used in datasheet while TMK uses **Byte**.\r
+\r
+AVR Boot section is located at end of Flash memory like the followings.\r
+```\r
+byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB1286)\r
+0x0000 +---------------+ 0x00000 +---------------+\r
+ | | | |\r
+ | | | |\r
+ | Application | | Application |\r
+ | | | | \r
+ = = = =\r
+ | | 32KB-4KB | | 128KB-8KB\r
+0x6000 +---------------+ 0x1E000 +---------------+\r
+ | Bootloader | 4KB | Bootloader | 8KB\r
+0x7FFF +---------------+ 0x1FFFF +---------------+\r
+\r
+ \r
+byte Teensy(ATMega32u4) byte Teensy++(AT90SUB1286)\r
+0x0000 +---------------+ 0x00000 +---------------+\r
+ | | | |\r
+ | | | |\r
+ | Application | | Application |\r
+ | | | |\r
+ = = = =\r
+ | | 32KB-512B | | 128KB-2KB\r
+0x7E00 +---------------+ 0x1FC00 +---------------+\r
+ | Bootloader | 512B | Bootloader | 2KB\r
+0x7FFF +---------------+ 0x1FFFF +---------------+\r
+```\r
+\r
+And see this discussion for further reference.\r
+https://github.com/tmk/tmk_keyboard/issues/179\r