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Add initial support for tinyuf2 bootloader (when hosted on F411 blackpill) (#12600)

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* 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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Nick Brassel 2021-04-25 13:40:56 +10:00 • committed by GitHub
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commit 891d18d356
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docs/flashing.md
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@ -249,3 +249,29 @@ Flashing sequence:
2. Wait for the OS to detect the device
3. Flash a .bin file
4. Reset the device into application mode (may be done automatically)
## tinyuf2
Keyboards may opt into supporting the tinyuf2 bootloader. This is currently only supported on the F411 blackpill.
The `rules.mk` setting for this bootloader is `tinyuf2`, and can be specified at the keymap or user level.
To ensure compatibility with the tinyuf2 bootloader, make sure this block is present in your `rules.mk`:
```make
# Bootloader selection
BOOTLOADER = tinyuf2
```
Compatible flashers:
* Any application able to copy a file from one place to another, such as _macOS Finder_ or _Windows Explorer_.
Flashing sequence:
1. Enter the bootloader using any of the following methods:
* Tap the `RESET` keycode
* Double-tap the `nRST` button on the PCB.
2. Wait for the OS to detect the device
3. Copy the .uf2 file to the new USB disk
4. Wait for the keyboard to become available