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..and what should this say about esp32? I don't understand what you are implying...
xtensa/tensilica is a good architecture, cheap and lean, unfortunately its biggest problem seems to be its harvard architecture and weird memory structure because out there I find very few loader/relocator impementations (nominally I only know niicoooo's version[1], brian pug's derivative[2] for his interesting joltos, mongoose/Zephyr's supercustom versions, and my own) and this seems to be the main stumbling block for new os development in this platform
[1] https://github.com/niicoooo/esp32-elfloader
[2] https://github.com/joltwallet/jolt_wallet/tree/master/jolt_o...
..and what should this say about esp32? I don't understand what you are implying...
xtensa/tensilica is a good architecture, cheap and lean, unfortunately its biggest problem seems to be its harvard architecture and weird memory structure because out there I find very few loader/relocator impementations (nominally I only know niicoooo's version[1], brian pug's derivative[2] for his interesting joltos, mongoose/Zephyr's supercustom versions, and my own) and this seems to be the main stumbling block for new os development in this platform
[1] https://github.com/niicoooo/esp32-elfloader
[2] https://github.com/joltwallet/jolt_wallet/tree/master/jolt_o...
I used RTEMS on Movius Myriad vision CPU (running on LEON- a SPARC clone).
I remember the RTEMS event concept was not very good- the events are globally shared. You are better off using semaphores.
>I have realized that for a majority of the embedded software using an RTOS is an overkill
I agree with this. Instead of an OS, we like to use a small framework that provides a CLI, database and UART communications (YMODEM protocol). It's a single stack system that provides a simple work-queue for scheduling future tasks / callbacks, and for interrupt code to schedule non-interrupt code. It works for almost everything as long as you are comfortable programming in an event-driven style.
https://github.com/nklabs/libnklabs
(recently added support for AVR 8-bit processors).