Re: Device trees and armv5

["Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>]

On Thu, Sep 04, 2025 at 01:55:51PM +0200, Yuri Honegger wrote:
> Hello,
> Recently, I've been playing around with porting NetBSD to the Lego Mindstorms EV3. 
> 
> The EV3 is based on an armv5 processor. I see that there are some ports that support armv5 and even the particular core used by the EV3. 
> 
> On linux, the EV3 support is done using device trees. While NetBSD also has device tree support, it seems to be limited to armv6 or higher.
> Is there a technical reason for it, or is it mainly because there hasn't been any development effort to add armv5 support?
> 

No technical reason; we just haven't hand any ARMv5 SoCs added since we
started using device trees.

> Also, what is the preferred way to add support for a new system: Fixing device trees so GENERIC also works with armv5, 
> or adding a new set of kernel configuration files specific to the EV3 to arch/evbarm/conf?
> 

Ideally it should be part of GENERIC.