[IsTom]

I don't have any experience with ARM, but from what I've seen people write, isn't 32-bit ARM discontinued after v7?

[ferriswil]

Their motivation is explained in the first post of the series[1]

[1] https://www.grisp.org/blog/posts/2025-06-23-jit-arm32.1#why-...

[snvzz]

For their real motivation[0], click on hardware at the top of the page.

Their existing hardware is aarch32. It really is that simple.

0. https://www.grisp.org/hardware

[bvttf]

loved them complaining about having "only" 16 registers

[crote]

There's still a huge embedded market!

Plenty of microcontrollers have a single-digit number of Cortex-M cores and memory/flash counted in the megabytes. It'll be decades until that market reaches the multi-gigabyte point, so why bother wasting a whole bunch of memory on 64-bit pointers?

I'm not quite sure why you'd want to run Erlang on it, but the hardware exists.

[derefr]

> I'm not quite sure why you'd want to run Erlang on it, but the hardware exists.

https://nerves-project.org/#features has a decent pitch for why. (Most of the features listed here aren't features of Nerves-the-Elixir-IoT-runtime-codebase per se, but rather benefits of Nerves-the-toolchain enabling you to easily build lean, embedded Erlang [on Linux] firmware images.)

[diegoperini]

> I'm not quite sure why you'd want to run Erlang on it, but the hardware exists.

Erlang is invented before IoT was a thing to facilitate distributed computing for telecommunication in a highly reliable manner. It makes perfect sense to adapt it for driving fleets of cheap IoT devices.

[bobmcnamara]

No, it's a supported ISA on most v8-a and I believe all v8-m implementations.

It's the only ISA on Cortex-A32, but not sure if any mainstream chips were ever produced with that core.

(Depending on course if you want to get specific about Arm/Thumb/Thumb2, I lumped them all together above).

[masklinn]

That does not mean ARM32 implementations and uses are stopping any time soon. Afaik arm hasn’t even obsoleted armv6, although Linux distributions are starting to drop it.

[whizzter]

Doesn't mean that machines won't be built with other chips for a considerable time.

That said, if you're putting something like Erlang on a chip, aren't one likely to want the extra memory (and performance) of a slightly newer SoC.

[LtdJorge]

Take a look at their products. Seems like they run bare metal Erlang on embedded devices.

[15155]

Cortex-M chips will still be made for decades.