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# Bootloader
## Bootloader binary
The binary comes from https://github.com/lupyuen/pinetime-rust-mynewt/releases/tag/v4.1.7
It must be flash at address **0x00** in the internal flash memory.
Using OpenOCD:
`
program mynewt_nosemi.elf_4.1.7.bin 0
`
## Application firmware image
Build the binary compatible with the booloader:
`
make pinetime-mcuboot-app
`
The binary is located in *<build directory>/src/pinetime-mcuboot-app.bin*.
It must me converted into a MCUBoot image using *imgtool.py* from [MCUBoot](https://github.com/JuulLabs-OSS/mcuboot/tree/master/scripts).
`
imgtool.py create --align 4 --version 1.0.0 --header-size 32 --slot-size 475136 --pad-header <build directory>/src/pinetime-mcuboot-app.bin image.bin
`
The image must be then flashed at address **0x8000** in the internal flash memory.
Using OpenOCD:
`
program image.bin 0x8000
`
## OTA and DFU
Pack the image into a .zip file for the NRF DFU protocol:
`
adafruit-nrfutil dfu genpkg --dev-type 0x0052 --application image.bin dfu.zip
`
Use NRFConnect or dfu.py to upload the zip file to the device:
`
sudo dfu.py -z /home/jf/nrf52/bootloader/dfu.zip -a <pinetime MAC address> --legacy
`
**TODO** : dfu.py
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