Reboot to bootloader

This implements rebooting to bootloader via os.reset(True). To do that we modify the bootloader so that it checks for a special file named .mscmode and if it's there it removes it and runs msc(). On Python side we declare .mscmode as a restricted file and create it before rebooting if needed.

This also improves update-bootloader.bin building because I didn't get a debugger :D It now automatically uses the latest bootloader, so you can grab update-bootloader.bin.

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• dd823731 - Don't require xxd to build

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Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

assigned to @schneider

This will not work with older bootloaders and most people will not update their bootloader. Can you think of a way to auto-update the bootloader?

FTR: There was an alternative implementation proposed by someone at card10 tent (sorry for forgetting your name!) - to try using SIMD registers for that purpose as they might be unaffected by reset. However I decided against it as we have no guarantee something won't accidentally set the magic bit and reset.

Actually, the whole of RAM is declared to be unphased by a reset according to the reference manual IIUC. So for this sort of reset, you could also put a special marker with validity check at a pre-defined address. I did a similiar implementation already a few weeks ago and it worked fine ;)

@schneider I'll try to think of something! The main problem is the firmware size I guess, and I'm also a bit afraid to automatically update to bootloader from master. I guess we could manually put "blessed" bootloader into the main firmware and then update it if needed.

added 46 commits

• dd823731...051036fe - 44 commits from branch card10:master
• 925d430a - Improve bootloader-update build process
• 65aa3589 - Implement reboot-to-bootloader call

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I re-implemented it to use API segment of memory now, using a magic value.

added 2 commits

• 19e615ce - Create libcard10-platform for shared constants
• b84db913 - Implement bootloader updates

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Finally we have bootloader updates implemented!

This needs to be thoroughly tested, we don't want to break people's devices. Current process to update the bootloader is:

1. cp build/hw-tests/bootloader-update/bootloader.h epicardium/
2. Bump BOOTLOADER_VERSION in lib/card10-platform/card10-platform.h

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• e9f8ba5b - Implement bootloader updates

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added 1 commit

• da6972f0 - Update Dockerfiles

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@q3k Can you update Docker images? We need xxd tool now.

added 44 commits

• da6972f0...781d4129 - 39 commits from branch card10:master
• 795d965c - Improve bootloader-update build process
• addcc9f6 - Implement reboot-to-bootloader call
• 57ddb643 - Create libcard10-platform for shared constants
• 19ca6393 - Implement bootloader updates
• 0b97b65e - Update Dockerfiles

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added 1-Additional-Feature label

added 6 - Needs Review label