Read somewhere that it is relatively easy to adapt NetBSD's drivers into a custom kernel... maybe Serenity folks can go that way? Device drivers are huge obstacle for any fledgling OS.
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I've wondered if new/hobby OSes would fare better by starting out targeting a popular single board computer like a raspberry pi? A mostly fixed set of hardware to make/get drivers for and test your system on.
But yes, raspi is a good platform if you are targeting arm.
As I'm also designing an OS, my biggest piece of advice for anyone seriously considering it is to target two archs at once, in parallel. Then adding a third becomes much easier.
Kernel is still in early stages but progress is steady - it's "quietly public". https://github.com/oro-os