4 ms·

You're using Arduinos at the "bare-metal" level, I assume? I'm not sure that rtems is really a non-MMU OS--it's really designed for multiprocessor systems w/ b

You're using Arduinos at the "bare-metal" level, I assume? I'm not sure that rtems is really a non-MMU OS--it's really designed for multiprocessor systems w/ bigger support than an Arduino offers, AFAIK. FreeRTOS has strong Arduino and Arduino IDE support. If you're sure you actually need this, and want to stay within the Arduino ecosystem, I'd start there.

elcritch 10y ago
Yes, bare metal. However, the libraries and tooling are somewhat limited once you start moving into more professional/commercial applications. MMU vs non-MMU turns out to be one of the limiting factors. I've experimented some with Cortex M0 boards. But fullscale Arm boards (e.g. NanoPi, OrangePis, RPi Zero) are approaching the cost points of small atmel and most non-mmu chips. So Ideally something that supports MMU and non-MMU as well could be interesting. Do you have any recommendations for chips which might support RTEMS or microkernels like Lk / sel4?
- davelnewton 10y ago
  IIRC most of the ARM chips can support it, but you'd need something w/ a full BSP unless you want to roll your own (ew). The cost factors have become pretty interesting. I've moved to ARM-based boards, but in general I've used a standard gcc toolchain along with FreeRTOS-like OSes and for anything beyond "oh you pushed a button" I skip the Arduino IDEs.
  - elcritch 10y ago
    BSP? Ah, gotcha. Yes, I was looking into RPi hardware since it's common enough that I figured there would be BSP support. It appears Lk micro-kernel supports RPi's. Otherwise, Beaglebone has a bit more open hardware board and one or two micro-kernel projects supported it. Not sure what the status of FreeRTOS or Zephyr is on any of the ARM boards. I'd look into setting up BSP for a good ARM chip as it'd make some of the hardware designs easier long term. Any recommendations board recommendations?
    - davelnewton 10y ago
      No board recommendations--there are soooo many now I have zero clue about "best" or if it even matters. I'm a little wary of the RPi 3 because of the heat issues; there are very competitive boards available at more or less the same price point, often with features I need (like actual SATA instead of via USB).

elcritch 10y ago

Yes, bare metal. However, the libraries and tooling are somewhat limited once you start moving into more professional/commercial applications. MMU vs non-MMU turns out to be one of the limiting factors. I've experimented some with Cortex M0 boards. But fullscale Arm boards (e.g. NanoPi, OrangePis, RPi Zero) are approaching the cost points of small atmel and most non-mmu chips. So Ideally something that supports MMU and non-MMU as well could be interesting. Do you have any recommendations for chips which might support RTEMS or microkernels like Lk / sel4?

davelnewton 10y ago
IIRC most of the ARM chips can support it, but you'd need something w/ a full BSP unless you want to roll your own (ew). The cost factors have become pretty interesting. I've moved to ARM-based boards, but in general I've used a standard gcc toolchain along with FreeRTOS-like OSes and for anything beyond "oh you pushed a button" I skip the Arduino IDEs.
- elcritch 10y ago
  BSP? Ah, gotcha. Yes, I was looking into RPi hardware since it's common enough that I figured there would be BSP support. It appears Lk micro-kernel supports RPi's. Otherwise, Beaglebone has a bit more open hardware board and one or two micro-kernel projects supported it. Not sure what the status of FreeRTOS or Zephyr is on any of the ARM boards. I'd look into setting up BSP for a good ARM chip as it'd make some of the hardware designs easier long term. Any recommendations board recommendations?
  - davelnewton 10y ago
    No board recommendations--there are soooo many now I have zero clue about "best" or if it even matters. I'm a little wary of the RPi 3 because of the heat issues; there are very competitive boards available at more or less the same price point, often with features I need (like actual SATA instead of via USB).