Add initial support for tinyuf2 bootloader (when hosted on F411 blackpill) (#12600)
* Add support for jumping to tinyuf2 bootloader. Adds blackpill UF2 example. * Update flashing.md * Update chconf.h * Update config.h * Update halconf.h * Update mcuconf.h
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@ -249,3 +249,29 @@ Flashing sequence:
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2. Wait for the OS to detect the device
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3. Flash a .bin file
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4. Reset the device into application mode (may be done automatically)
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## tinyuf2
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Keyboards may opt into supporting the tinyuf2 bootloader. This is currently only supported on the F411 blackpill.
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The `rules.mk` setting for this bootloader is `tinyuf2`, and can be specified at the keymap or user level.
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To ensure compatibility with the tinyuf2 bootloader, make sure this block is present in your `rules.mk`:
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```make
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# Bootloader selection
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BOOTLOADER = tinyuf2
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```
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Compatible flashers:
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* Any application able to copy a file from one place to another, such as _macOS Finder_ or _Windows Explorer_.
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Flashing sequence:
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1. Enter the bootloader using any of the following methods:
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* Tap the `RESET` keycode
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* Double-tap the `nRST` button on the PCB.
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2. Wait for the OS to detect the device
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3. Copy the .uf2 file to the new USB disk
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4. Wait for the keyboard to become available
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