A few years back I started trying to build something similar off of the STM32F4 line of ARM MCUs.

https://www.st.com/en/microcontrollers-microprocessors/stm32f4-series.html

Supports ethernet, spi, usb otg, etc.  Thought about porting the libstyx library from Inferno over to
the STM32 platform.

https://github.com/inferno-os/inferno-os/tree/master/tools/styxtest

Thin OS layer was provided by FreeRTOS.  STM32F4 specific HW was accessed using libopencm3

https://libopencm3.org/

If interested...

https://github.com/tmendoza/stm32f4-template

Tony

On 1/28/2022 at 4:18 AM, "Lucio De Re" <lucio.dere@gmail.com> wrote:
On 1/28/22, Bakul Shah <bakul@iitbombay.org> wrote:
>
> Think of really simple, low power, low cost devices.
> USB can also provide power. USB+ATtiny85 devel boards
> cost ~$3 even at Amazon. And FPGA boards can be
> pretty inexpensive too. If you can find them.
>
I've recommended olimex.com in the past. They specialise in Open
Architecture Hardware. Their prices are very reasonable and product
range quite broad.

Lucio.

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