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([2001:8b0:aba:5f3c:f7eb:cc84:5778:9052]) by smtp.gmail.com with ESMTPSA id t11-20020a05600c198b00b0041270c2b95esm4364471wmq.29.2024.02.21.03.21.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Feb 2024 03:21:40 -0800 (PST) Message-ID: Subject: Re: [Openembedded-architecture] [RFC PATCH] Add genericarm64 MACHINE using upstream defconfig From: Richard Purdie To: Ross Burton , poky@lists.yoctoproject.org Cc: openembedded-core@lists.openembedded.org, openembedded-architecture@lists.openembedded.org Date: Wed, 21 Feb 2024 11:21:39 +0000 In-Reply-To: <20240221105723.1501833-1-ross.burton@arm.com> References: <20240221105723.1501833-1-ross.burton@arm.com> Autocrypt: addr=richard.purdie@linuxfoundation.org; prefer-encrypt=mutual; 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YNvg== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.0-1 MIME-Version: 1.0 List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Wed, 21 Feb 2024 11:21:46 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/195968 On Wed, 2024-02-21 at 10:57 +0000, Ross Burton wrote: > From: Ross Burton >=20 > This is a new 64-bit "generic" Arm machine, that expects the hardware to > be SystemReady IR compatible. This is slightly forward-leaning as there's > not a _lot_ of SystemReady hardware in the wild, but most modern boards > are and the number will only grow.=C2=A0 Also, this is the only way to ha= ve a > 'generic' machine as without standardised bootloaders and firmware it > would be impossible. >=20 > The base machine configuration isn't that exciting: it's a fully featured > machine that supports most things, booting via UEFI and an initramfs. >=20 > However, the kernel is more interesting.=C2=A0 This RFC uses the upstream= defconfig > because unlike some other platforms, the arm64 defconfig is actively > maintained with the goal of being a 'boots on most hardware' configuratio= n. > My argument is: why would we duplicate that effort? Can you point at the policy/process which decides how a config option makes it in there? > The "linux-yocto way" is configuration fragments and after a week of > hair-pulling I do actually have fragments that boot on a BeaglePlay, but > to say this was a tiresome and frustrating exercise would be understating= it. >=20 > So, a request for comments: is it acceptable to use the upstream defconfi= g in > a reference BSP?=C2=A0 Personally I'm torn: the Yocto way is fragments no= t monolithic > configs, but repeating the effort to fragmentise the configuration and th= en > also have it sufficiently modular that it can be used in pieces - instead= of > just being a large file split up into smaller files - is a lot of effort = for > what might end up being minimal gain.=C2=A0 My fear is we end up with a f= ragmented > configuration that can't be easily modified without breaking some platfor= ms, > and badly copies what the defconfig already does. Let me play devils advocate. I do understand it is a pain, equally, once you do have it working, it is something you rarely have to touch again for a given board. In the context of linux-yocto, I suspect we'd end up with a few board specific lists of config options (fragments) that board *really* needs. genericarm64 would end up as the sum of all those configs, plus any other bits which you really want in a generic machine, presumably the genericx86 machines have an idea of that. The advantage here is that you give the users three options: a) the kitchen sink upstream "systemready" defconfig b) the genericarm64 machine defconfig which works most places and=C2=A0 is=C2=A0'guaranteed' on our target test platforms c) a machine targeted defconfig with only what a board needs Developers/users end up in different places at different points in there lifecycles.=C2=A0 For in depth development, you might like to be able to cut the kernel down so you'd not rebuilding tons of stuff you don't need/use/care about each time, nor transferring it to a device during updates. For a specific product release, you again might want to trim it down to what it needs. If you're shipping demo software, a full systemready image would be much more appropriate. I think it comes down to whether the fragments are usable and testable. We have a list of targets we want this new machine to run on so lets start with those, define genericarm64 as that set of fragments combined plus the generic pieces linux-yocto adds, then go from there. If you add a new machine to the test matrix, we add a new fragment. If someone wants to add new config, they need to show a machine using it. Cheers, Richard