Hi Valeros,
I know this is an old topic, but I am facing a similar issue.
See my thread STM32H747XI-DISCO (env:disco_h747xi) and stm32cube-hal-blinky can not build
I tried what you suggest here, this is the ouput:
Processing disco_h747xi (platform: ststm32; framework: https://github.com/platformio/platform-ststm32.git; board: disco_h747xi)
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Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/ststm32/disco_h747xi.html
PLATFORM: ST STM32 (15.4.0) > STM32H747I-DISCO
HARDWARE: STM32H747XIH6 400MHz, 512KB RAM, 2MB Flash
DEBUG: Current (stlink) On-board (stlink) External (blackmagic, cmsis-dap, jlink)
PACKAGES:
- toolchain-gccarmnoneeabi @ 1.70201.0 (7.2.1)
Error: This board doesn't support https://github.com/platformio/platform-ststm32.git framework!
============================================================= [FAILED] Took 0.25 seconds =============================================================