This is a highly experimental and very much work in progress implementation of FreeRTOS for the Datafrog SF2000 retro handheld.

Short answer? Because I can.

Long answer: Right now there is no CFW for the SF2000.

This is due to the HiChip HC1512 B210 being a niche, non-standard CPU with proprietary software and libraries. There has been some on-going work to discover ways to use the proprietary, closed source blobs (particularly libvid.a) in software other than the stock OS or the hcRTOS SDK that was provided (without notice) after much back and forth with Datafrog.

That being said, it feels like the software (both stock and hcRTOS) are not doing this peculiar chip justice, and may even be holding the hardware back.

My ultimate goal for implementing FreeRTOS on the SF2000 is to create an open custom firmware that will allow the full potential of this cheap (~$15USD) toy to be unblocked. At this point, we'll file it under "Proof of Concept".

As of 2023-10-25: it compiles using the SF2000 toolchain.

That's it.

As of right now, I have lots of things I want this to be, but not a lot of expectations that it will be able to become those things.

NOTE: this has only been tested on Linux on a X86_64 processor.

Before we begin, make sure that:

• You have Docker installed on your development machine, and
• you are comfortable with some Mild Command Line use

First, clone this repo:

git clone <github link here>

Next, cd into the sf2000-freertos directory and run the following:

make shell

This will create the docker image, start the docker container, and then drop you into a shell inside the container. This Docker has everything contained inside:

• The toolchain for the SF2000
• The code for the RTOS from this repo

Configuration is done in config/defaultconfig. Once configured, build the "OS" with make all.

Voila! You have just compiled FreeRTOS for the SF2000, and should have a ready to use* bsrv.asd in the output folder.

*As of 2023-10-25, this has not been tested on actual hardware and is expected to (best case scenario) not work, or possibly (worst case) break things and potentially make your device unusable.