Add stm32h743 board family

[nuraci]

Summary

Fixed an error reported by the build process

Testing

• Build firmware for DEV190806042: make BOARD=DEV190806042

---

Summary by cubic

Adds STM32H743 board family support with QSPI flash, external SDRAM, LTDC display, and USB FS, and fixes an SD card build error on STM32H7_CORE V10 by using SDMMC2 and the correct pins.

• New Features

  • Adds DEV190806042, FK743M5-XIH6, and STM32H7_CORE (variants V10 and V13).
  • QSPI flash block device with cache; board-specific sizes and prescaler.
  • 32MB SDRAM enabled with startup test and heap placement when valid.
  • USB FS (2x CDC + MSC) and LTDC/DMA2D with LVGL hooks.
  • Board-specific linker scripts and HAL config for H743 clocks/memory.
  • Internal flash storage disabled to avoid known option-bytes issue.

• Bug Fixes

  • STM32H7_CORE V10: route SD card to SDMMC2 to fix build failure.

^{Written for commit d84e00f. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 26 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="ports/stm32/boards/FK743M5-XIH6/mpconfigboard.mk">

<violation number="1" location="ports/stm32/boards/FK743M5-XIH6/mpconfigboard.mk:10">
P2: Board config hard-codes LVGL module paths that don’t exist in the repo, likely breaking builds for this board in a clean checkout.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[nuraci]

Status update for anyone landing on this PR from a search:

I'm pausing this PR while I migrate the work to repositories with more active maintenance.

• Boards (DEV190806042, FK743M5-XIH6, STM32H7_CORE): I'm re-submitting them directly to micropython/micropython upstream, same path that WEACTSTUDIO_MINI_STM32H743 took into v1.27. Once merged upstream, any downstream LVGL fork will pick them up automatically at the next MicroPython submodule bump.
• LTDC + GT911 drivers (originally lvgl/lv_binding_micropython#407): being adapted to lvgl-micropython/lvgl_micropython to fit its lcd_bus / api_drivers architecture. Architectural discussion is open at: STM32H7 LTDC + board family: would a contribution series be welcome, and what's the preferred architecture? lvgl-micropython/lvgl_micropython#577.

For context, the migration is motivated by infrastructure rather than disagreement: the STM32 CI workflow on this repo is currently disabled, the runner-update PR (#102) has been open since August 2025, and master here is several MicroPython releases behind upstream.

I'm leaving this PR open in case the situation changes. Happy to rebase and reactivate it if #102 gets merged and a reviewer becomes available for STM32 work. cc @kisvegabor @PGNetHun

— @nuraci