67 lines
No EOL
2.1 KiB
Markdown
67 lines
No EOL
2.1 KiB
Markdown
# Bootloader
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## Bootloader graphic
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The bootloader loads a graphic (Pinetime logo) from the SPI Flash memory. If this graphic is not loaded in the memory, the LCD will display garbage (the content of the SPI flash memory).
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The SPI Flash memory is not accessible via the SWD debugger. Use the firmware 'pinetime-graphics' to load the graphic into memory. All you have to do is build it and program it at address 0x00 :
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- Build:
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```
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$ make pinetime-graphics
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```
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- Program (using OpenOCD for example) :
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```
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program pinetime-graphics.bin 0
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```
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- Let it run for ~10s (it does nothing for 5 seconds, then write the logo into the SPI memory, then (slowly) displays it on the LCD).
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## Bootloader binary
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The binary comes from https://github.com/lupyuen/pinetime-rust-mynewt/releases/tag/v4.1.7
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It must be flash at address **0x00** in the internal flash memory.
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Using OpenOCD:
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`
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program mynewt_nosemi.elf_4.1.7.bin 0
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`
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## Application firmware image
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Build the binary compatible with the booloader:
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`
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make pinetime-mcuboot-app
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`
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The binary is located in *<build directory>/src/pinetime-mcuboot-app.bin*.
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It must me converted into a MCUBoot image using *imgtool.py* from [MCUBoot](https://github.com/JuulLabs-OSS/mcuboot/tree/master/scripts). Simply checkout the project and run the script <mcuboot root>/scripts/imgtool.py with the following command line:
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`
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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
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`
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The image must be then flashed at address **0x8000** in the internal flash memory.
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Using OpenOCD:
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`
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program image.bin 0x8000
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`
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## OTA and DFU
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Pack the image into a .zip file for the NRF DFU protocol:
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`
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adafruit-nrfutil dfu genpkg --dev-type 0x0052 --application image.bin dfu.zip
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`
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Use NRFConnect or dfu.py (in <project root>/bootloader/ota-dfu-python) to upload the zip file to the device:
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`
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sudo dfu.py -z /home/jf/nrf52/bootloader/dfu.zip -a <pinetime MAC address> --legacy
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`
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**Note** : dfu.py is a slightly modified version of [this repo](https://github.com/daniel-thompson/ota-dfu-python). |