add support for stm32f412xE

[bakatrouble]

Description

Add support for STM32F412xE MCUs.

Flash EEPROM support also requires merging this commit from ChibiOS upstream to https://github.com/qmk/ChibiOS repo: ChibiOS/ChibiOS@8d2daab

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[tzarc]

Marked this as draft/on-hold — we’ll need to see the ChibiOS side on the stable 21.11.x branch before QMK can consume it, as we don’t maintain patches of our own.

[bakatrouble]

Marked this as draft/on-hold — we’ll need to see the ChibiOS side on the stable 21.11.x branch before QMK can consume it, as we don’t maintain patches of our own.

the commit is already included in the ver21.11.4

[tzarc]

Ah, you linked a master/trunk rev, didn’t realise it was already backported.

I’ll see if I can bump the submodule on develop later tonight.

[bakatrouble]

master/trunk rev

Yes, about a year ago i got an answer that I should get the patch into upstream. Since then, I did.

[tzarc]

#25730 has the update, however, it seems a lot of things are broken. Will investigate there.