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I would like to explore the RISC-V systems more as well eventually, but for the nearest future I will probably stick with one platform, try to get my actual device to do more of the fun things I like.

Mostly if you like the usual ESP-IDF setup and ecosystem.

BreezyBox is at an early development stage. What you see in the demo is mostly all there is so far. There is no telling if it will catch on, with more developers adding apps and features.

Some sort of web access for remote config should be possible, if anyone cares to implement that. The web server is already there; getting it to run some server side code may take extra effort.

It should be possible to get most of it compiled for C3, C6, or P4. But xcc700 is specific to the Xtensa CPU, so that would be a bigger effort. And the ELF binaries you install with eget would need to be recompiled (with existing gcc) and published for RISC-V. When it gets to that, we should make some minimal manifest support to eget and the release conventions, to distinguish between ELF files for different platforms. Also keep in mind how much PSRAM is available, if any.

I am looking forward to $20 laptops on aliexpress running this thing!

Right, people were asking about the shell used in the xcc700 demo, so that is released now too, and I tried to make it convenient to reuse as a component.

Esp32-s3 can do so much more, we are just scratching the surface. You might remember FabGL, that ran some nice demos in the realm of games and DOS emulation. Unfortunately, seems to be hard to update for modern versions of ESP-IDF. I am trying to build something more modular, with hope that some parts of it will survive longer.

I think someone also ran an old version of MacOS simulated on it, too, that is also an indication of the general capability.

Some parts of it, very likely. The shell is just linenoise with some glue code. How are things with ELF loading on rp2350, I did not check. May be possible, the question is, how much effort. In ESP-IDF that is a standard component now.

The memory model is flat enough. The problem with the memory is, you only have about 200kB traditional RAM. But then, you have 8MB of PSRAM. But it requires strict 4-byte alignment, and is noticeably slower.

What makes traditional OSs difficult on this platform, is the lack of memory protection. But I am a simple man, I am not writing an OS, all I wanted was a usable shell and an apps installer, so I made that work.

Porting to different CPU/bytecodes should be doable. Just keep in mind that in ESP-IDF we also get the dynamic linker and the libc for free (and any other C functions exposed in the firmware). On the other platforms, that may be some extra work for the compiler.

I only wrote the compiler. But ESP-IDF elf_loader component can do that, yes.