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Tools: added bootloader docs

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Andrew Tridgell 2018-07-04 19:11:10 +10:00
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# ArduPilot Bootloader
This is the bootloader used for STM32 boards for ArduPilot. To build
the bootloader do this:
```bash
./waf configure --board BOARDNAME --bootloader
./waf bootloader
```
the bootloader will be in build/BOARDNAME/bin. If you have the
intelhex module installed it will build in both bin format and hex
format. Both are usually uploaded with DFU. The elf file will be in
build/BOARDNAME/AP_Bootloader for loading with gdb.
The --bootloader option tells waf to get the hardware config from
the hwdef-bl.dat file for the board. It will look in
libraries/AP_HAL_CHibiOS/hwdef/BOARDNAME/hwdef-bl.dat
The bootloader protocol is compatible with that used by the PX4
project for boards like the Pixhawk. For compatibility purposes we
maintain a list of board IDs here:
https://github.com/ArduPilot/Bootloader/blob/master/board_types.txt
the board IDs in that file match the APJ_BOARD_ID in the hwdef.dat and
hwdef-bl.dat files
The bootloader can load from USB or UARTs. The list of devices to load
from is given in the UART_ORDER option in hwdef-bl.dat