DRdrivers99·May 13, 2022
I want to write one for bare metal (non-Linux) raspberry pi (ARMv6 32 bit on Raspberry Pi 1 and Zero; ARMv7 and ARMv8 on higher models and also supports 64 bit). I want to have no dependencies required though so was thinking of bootstrapping it with nothing but machine code (determined initially with the help of an assembler and documentation of course). Someone has already ported jonesforth the Raspberry Pi[1] but using serial i/o as the user interface and it has dependecies to build it, but I should be able to get ideas from how they coded their assembly parts compared to the original jonesforth. I want to be able to use HDMI for the screen (already tried it out with some bare metal tutorials in assembly so that's do-able) and again, with no dependencies. And I want to show people how to do it themselves, not just have it be something t
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o run that they don't understand fully. It should also be possible to have the forth kernel build/assemble itself if needed, or cross-target another platform.
I know I'm all talk right now, like you say, I need to manage my free time so that I would have the "copious free time" to work on this.
The only reason I was thinking Raspberry Pi was I wanted something that would be readily available to anyone (although, at the moment it's out of stock due to supply chain issues). I was actually looking at whether anything similar was available with RISC-V (like you mentioned) to target, since that would be interesting.
[1] https://github.com/organix/pijFORTHos