linux-kernel - Re: [PATCH 0/5] arm: dts: linksys: rename codename to model

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Date:   Wed, 8 Apr 2020 02:09:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Paul Spooren <mail@...rcar.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        jason@...edaemon.net, gregory.clement@...tlin.com,
        sebastian.hesselbarth@...il.com, daniel@...rotopia.org,
        freifunk@...ianschmutzler.de, kaloz@...nwrt.org
Subject: Re: [PATCH 0/5] arm: dts: linksys: rename codename to model

On Tue, Apr 07, 2020 at 01:38:17PM -1000, Paul Spooren wrote:
> Hi Andrew,
> 
> thank you very much for the quick response!
> Are you okay with adding the new compatible string as first element of
> the list? This would already simplify the OpenWrt build system.

That should be fine. OF will keep searching from first till last for a
match. 

> What about the changed labels? Are they considered ABI too?

You mean LED names. I would consider those ABI. People can have
scripts which configure the LEDs how they want, blinking heartbeat,
etc.

> Regarding file names, I'm new to ABI policies. Within OpenWrt this is
> all done via a single line patch, I'm not familiar with any other
> installers/bootloaders. 

Well, it would break how i boot my wrt1900ac. I tftpboot it, grabbing
both the kernel and the DB blob from my TFTP server. If the blob
changes names, i would need to modify my uboot configuration. 

I don't know if Debian has full support for any of these boards, but
if i remember correctly, flash-kernel has a database of machine names
and DTB file names. My wrt1900ac is quite happy running Debian, but i
don't have it booting the Debian way, because i use it for kernel
hacking. But maybe there are people out there that do.

	 Andrew