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It's usually not the amount of flash that's the problem with an RTOS on an embedded microcontroller. It's the amount of RAM. Because each process requires it's own stack. That said STM32 parts generally have enough.

They're probably talking about boards like this that also have megabytes of SDRAM. https://www.st.com/en/evaluation-tools/32f429idiscovery.html

While I am aware of the technical specs, my point is about the wording itself. This was just an example. The "Docs" section for example doesn't actually hold any documentation.

Something about this website feels uncanny, hence my (joking) guess regarding GPT-3.

It can be as low as 64K in the case of the STM32F410 but I can't tell whether it would be supported.