From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C661318B96; Mon, 9 Feb 2026 07:51:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770623483; cv=none; b=qSMj7rNt+w7z3H045Hzw1cCoNmY1FdnrFWECvXB8/84HlKJnH9ElrES4vV5sjsf/FEHeX5JTEpYpkelHmse/C0aEFdicBgt8tWhGO9r6DGTim9KrSJd7At3fGYhA5Vx6oHPDRnf1w3DQnODRIQnsgeOfNLzTxQ76Q36zl8ALMd0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770623483; c=relaxed/simple; bh=tra1nGlLkCkWrSabfPDcu8ZuECM2MQK2rXwhoc1KMVA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Zxfpv0UqUl2Sbi6x8OTMinTpOoHFTcJemKgsl7alOlUQ1eMnB2dTbPHGLYAZsa2UldwWHqFZQH7hnaPkvhJyfD7z4zPpVSpxcZyfVT6MgLj7pn6A7qDttrn0gAhEZjJnU6hNWwkR4v8j4yutCn1IlzZANwiH8LPT7Odbk5w7su0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=r7ESbaM3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="r7ESbaM3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A9B9EC116C6; Mon, 9 Feb 2026 07:51:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770623483; bh=tra1nGlLkCkWrSabfPDcu8ZuECM2MQK2rXwhoc1KMVA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=r7ESbaM3Q8pZlvmWhFVRH5o94GyXn8ZSDUmqs07VGs0dWkVx6L5eT14Nv4S6litfI y254riFFhuBYpKTg1qapgqulUQCCvaVgXCYgamqdXQxoU8AVPGGMjJ2GCtIbFgALOP pncmSmNV8QshZhVXgytbO8cv5l8FXsfGGnRvCX1eV/CEn2DU7ClMsXRuzELDEL4/Vl 1j3iXt4tbT03LZgjQNFJsGvNxX7+IeIcjJP4HxxnW+prOlvpGmmYdZkl8BD8iYp33d g2WM1v/9zK2/h36PPCilBJ8Ex/fuRFZk/G5nNxL8DWpl/rj0EstyuKVH5Or0UgYwen k2r4ZbK0d4TSg== Message-ID: <487e4605-0a21-48d6-8b77-9ce2799ad212@kernel.org> Date: Mon, 9 Feb 2026 08:51:18 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] arm64: dts: qcom: sm8550: Fix DTBO boot failure To: Aaron Kling Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kumar Sharma , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Pavan Kondeti References: <20260207-sm8550-abl-dtbo-v2-1-83afaa6f3ce9@gmail.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 08/02/2026 16:10, Aaron Kling wrote: > On Sun, Feb 8, 2026 at 3:07 AM Krzysztof Kozlowski wrote: >> >> On 08/02/2026 02:16, Aaron Kling via B4 Relay wrote: >>> From: Pavan Kondeti >>> >>> ABL requires certain things in the base dtb to apply a dtbo. Namely: >>> >>> * A label named qcom_tzlog must exist, but doesn't have to contain any >>> specific properties >>> * The timer node must have a label named arch_timer >>> >>> This aligns the sm8550 soc dtsi with those requirements. Without these >>> in the base dtb, when ABL attempts to apply any dtbo, it will fail to >>> the bootloader menu. >>> >> >> Incomplete DCO chain. >> >>> Co-authored-by: Aaron Kling >>> Signed-off-by: Aaron Kling >>> --- >>> With a current mainline sm8550 base dtb, ABL will fail to apply any dtbo >>> and fail back to the bootloader menu. There are two changes needed: >> >> Since when? We were testing SM8550 (me on QRD) all the time and there >> was no problem. >> >> You need to provide details which hardware needs it, if this is about to >> expected, but honestly, we don't add such nodes/labels for downstream >> bootloader. Qualcomm should fix the bootloder instead. > > This discussion has been ongoing in a couple places. It is needed on > all semi-recent recent qcom socs. See this chain [0] on my sm8550 Explanation must be in this commit, not in other places. > questions thread and the previous revision of this series [1]. This > has been a known issue for a while, see this comment [2] on the gunyah > watchdog series, which is what the series was based on. But that [2] still speaks about overlay. You are suppose to boot standard kernel with typical setup - concatenated DTB. If you want some other ways, like choosing overlays by ABL or whatever else, you need to fix ABL. You want to use some custom boot way of ABL, but it's broken... yet it is no reason to add these properties. What if I want to boot DTJUNK files via my custom ABJUNK - can I add such things to upstream? No. You cannot add properties to support custom boot of ABL if that boot is broken. > > My current understanding is that the qcom_tzlog and arch_timer labels > are required period for abl to apply a dtbo. And this setup will only Best regards, Krzysztof