Aye, it's an MCU I was thinking of in the first place, where read/write operations are done through a reasonably simple Flash controller and can be abstracted i

Aye, it's an MCU I was thinking of in the first place, where read/write operations are done through a reasonably simple Flash controller and can be abstracted in a separate driver. I have written FS drivers of fairly similar complexity, in pretty much similar space constraints. That's why I wasn't incredulous.