Difference between revisions of "PineTime SD MCUBoot"
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The | The Problem: | ||
- PineTime ships with the MCUBoot Bootloader which boots to the InfiniTime Firmware | - PineTime ships with the MCUBoot Bootloader which boots to the InfiniTime Firmware | ||
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- How do we allow SoftDevice-based firmware to be flashed to PineTime via DFU? | - How do we allow SoftDevice-based firmware to be flashed to PineTime via DFU? | ||
Preferred Solution: | |||
- We will use DFU to flash a SoftDevice Loader Firmware, which will boot and replace MCUBoot by SoftDevice | |||
- Thereafter, when PineTime boots, it will start SoftDevice and will be ready to accept SoftDevice-based firmware for DFU: wasp-os, ATCWatch | |||
- When we need to switch back to MCUBoot-based firmware (InfiniTime, Mynewt, Zephyr, ...), we will run an MCUBoot Loader to replace SoftDevice by MCUBoot plus a Minimal DFU Firmware that accepts DFU commands | |||
- After rebooting, MCUBoot starts the Minimal DFU Firmware, which will accept MCUBoot-based firmware for flashing | |||
- The MCUBoot-based firmware replaces the Minimal DFU Firmware | |||
- SoftDevice Loader, https://github.com/daniel-thompson/wasp-reloader | - SoftDevice Loader, https://github.com/daniel-thompson/wasp-reloader | ||
Alternative Solution: | |||
- Custom MBR: https://forum.pine64.org/showthread.php?tid=9779&pid=65203#pid65203 | - Custom MBR: https://forum.pine64.org/showthread.php?tid=9779&pid=65203#pid65203 | ||
Revision as of 16:47, 10 August 2020
The Problem:
- PineTime ships with the MCUBoot Bootloader which boots to the InfiniTime Firmware
- This assumes that the firmware (InfiniTime, Mynewt, Zephyr, ...) has its own Bluetooth LE (BLE) stack and can handle firmware updates (DFU)
- But some firmware (wasp-os, ATCwatch) require Nordic SoftDevice to be installed to support the BLE and DFU functions
- InfiniTime Firmware does not support flashing of SoftDevice as firmware update, because SoftDevice needs to be flashed at address 0x0, which is used by the MCUBoot Bootloader
- How do we allow SoftDevice-based firmware to be flashed to PineTime via DFU?
Preferred Solution:
- We will use DFU to flash a SoftDevice Loader Firmware, which will boot and replace MCUBoot by SoftDevice
- Thereafter, when PineTime boots, it will start SoftDevice and will be ready to accept SoftDevice-based firmware for DFU: wasp-os, ATCWatch
- When we need to switch back to MCUBoot-based firmware (InfiniTime, Mynewt, Zephyr, ...), we will run an MCUBoot Loader to replace SoftDevice by MCUBoot plus a Minimal DFU Firmware that accepts DFU commands
- After rebooting, MCUBoot starts the Minimal DFU Firmware, which will accept MCUBoot-based firmware for flashing
- The MCUBoot-based firmware replaces the Minimal DFU Firmware
- SoftDevice Loader, https://github.com/daniel-thompson/wasp-reloader
Alternative Solution:
- Custom MBR: https://forum.pine64.org/showthread.php?tid=9779&pid=65203#pid65203