The Quicklogic EOS S3 looks like an interesting part:
Benefits
- Easy-to-use, low cost dev kit and open source software toolchains integrates into your own work flow
- With multiple product delivery packages (CSP, BGA, SiP, Module), you have the flexibility to choose what is best for YOUR system
- Go from idea to prototype to mass production quickly with the EOS S3 SoC
Features
- 100% Free and Open Source Tools including:
- Zephyr and FreeRTOS for integrated Arm Cortex®-M4F MCU
- SymbiFlow supports Verilog-to-bitstream for integrated eFPGA
- Renode SoC emulation for pre-hardware software development
I started my career writing assembler code for the 68HC05 ROM based MCU (no flash in those days). These parts could be programmed once, unless you bought a special “windowed” version that could be erased by ultraviolet light (took 30m or so in the UV box). Things have come a long way since then …