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@@ -106,21 +106,50 @@ http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
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## Bootloader jump doesn't work
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-Properly configure boot section size in Makefile. With wrong section size bootloader won't probably start with **Magic command** and **Boot Magic**.
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-- https://github.com/tmk/tmk_keyboard#magic-commands
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-- https://github.com/tmk/tmk_keyboard#bootloader
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-
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+Properly configure bootloader size in Makefile. With wrong section size bootloader won't probably start with **Magic command** and **Boot Magic**.
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```
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-# Boot Section Size in *bytes*
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-# Teensy halfKay 512
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-# Teensy++ halfKay 1024
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-# Atmel DFU loader 4096 (TMK Alt Controller)
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-# LUFA bootloader 4096
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-# USBaspLoader 2048
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+# Size of Bootloaders in bytes:
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+# Atmel DFU loader(ATmega32U4) 4096
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+# Atmel DFU loader(AT90USB128) 8192
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+# LUFA bootloader(ATmega32U4) 4096
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+# Arduino Caterina(ATmega32U4) 4096
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+# USBaspLoader(ATmega***) 2048
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+# Teensy halfKay(ATmega32U4) 512
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+# Teensy++ halfKay(AT90USB128) 1024
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OPT_DEFS += -DBOOTLOADER_SIZE=4096
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```
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+AVR Boot section size are defined by setting **BOOTSZ** fuse in fact. Consult with your MCU datasheet.
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+Note that **Word**(2 bytes) size and address are used in datasheet while TMK uses **Byte**.
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+
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+AVR Boot section is located at end of Flash memory like the followings.
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+```
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+byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB1286)
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+0x0000 +---------------+ 0x00000 +---------------+
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+ | | | |
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+ | | | |
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+ | Application | | Application |
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+ | | | |
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+ = = = =
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+ | | 32KB-4KB | | 128KB-8KB
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+0x6000 +---------------+ 0x1FC00 +---------------+
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+ | Bootloader | 4KB | Bootloader | 8KB
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+0x7FFF +---------------+ 0x1FFFF +---------------+
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+
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+
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+byte Teensy(ATMega32u4) byte Teensy++(AT90SUB1286)
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+0x0000 +---------------+ 0x00000 +---------------+
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+ | | | |
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+ | | | |
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+ | Application | | Application |
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+ | | | |
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+ = = = =
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+ | | 32KB-512B | | 128KB-1KB
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+0x7E00 +---------------+ 0x1FC00 +---------------+
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+ | Bootloader | 512B | Bootloader | 1KB
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+0x7FFF +---------------+ 0x1FFFF +---------------+
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+```
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-And see this discussion.
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+And see this discussion for further reference.
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https://github.com/tmk/tmk_keyboard/issues/179
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tmk