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Wed, 13 Jul 2022 12:00:07 +0000 (UTC) MIME-Version: 1.0 Date: Wed, 13 Jul 2022 14:00:06 +0200 From: =?UTF-8?Q?Rafa=C5=82_Mi=C5=82ecki?= To: Krzysztof Kozlowski Cc: Florian Fainelli , William Zhang , Linux ARM List , kursad.oney@broadcom.com, anand.gore@broadcom.com, dan.beygelman@broadcom.com, Broadcom Kernel List , joel.peshkin@broadcom.com, Krzysztof Kozlowski , Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 3/3] arm64: dts: bcmbca: update bcm4808 board dts file In-Reply-To: <7cf0e9b7-4316-1a23-3484-03e5f0491393@linaro.org> References: <20220712021144.7068-1-william.zhang@broadcom.com> <20220712021144.7068-4-william.zhang@broadcom.com> <900ac3ed-a77c-3cc0-f5ab-c45267a1a4ba@gmail.com> <7cf0e9b7-4316-1a23-3484-03e5f0491393@linaro.org> User-Agent: Roundcube Webmail/1.4.13 Message-ID: X-Sender: rafal@milecki.pl X-Originating-IP: 194.187.74.233 X-Webmail-UserID: rafal@milecki.pl Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Ovh-Tracer-Id: 12957700555834698715 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedrudejjedggeeiucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepggffhffvvefujghffgfkgihitgfgsehtkehjtddtreejnecuhfhrohhmpeftrghfrghlpgfoihhlvggtkhhiuceorhgrfhgrlhesmhhilhgvtghkihdrphhlqeenucggtffrrghtthgvrhhnpeevjefhffffveeludejfedtvdfftdekgffghfegieeliedvfeeigfejteejjeekfeenucfkpheptddrtddrtddrtddpudelgedrudekjedrjeegrddvfeefnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmohguvgepshhmthhpohhuthdphhgvlhhopehplhgrhigvrhejledvrdhhrgdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomheprhgrfhgrlhesmhhilhgvtghkihdrphhlpdhnsggprhgtphhtthhopedupdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdfovfetjfhoshhtpehmohehhedt Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2022-07-13 13:09, Krzysztof Kozlowski wrote: > On 13/07/2022 12:55, Rafał Miłecki wrote: >> On 2022-07-12 17:36, Florian Fainelli wrote: >>> On 7/12/22 00:47, Krzysztof Kozlowski wrote: >>>> On 12/07/2022 04:11, William Zhang wrote: >>>>> Update compatible string based on the new bcmbca binding rule >>>>> for BCM4908 famliy based boards >>>> >>>> Typo - family >>>> >>>> Please explain why breaking the ABI (and users of these DTS_ is >>>> acceptable. >>> >>> This will be largely targeted towards Rafal who supports these kinds >>> of devices with an upstream kernel. My understanding is that this is >>> OK because we will always ship a DTB matching the Linux kernel, and I >>> believe this is true for both the way that William and his group >>> support these devices, as well as how OpenWrt, buildroot or other >>> build systems envision to support these devices. >>> >>> Rafal, does that sound about right? >> >> Right - in all cases I'm aware of - Linux gets shipped with DTB files. >> So such change won't actually break anything in real world. > > We don't really talk here about Linux, but other projects, like > bootloaders or *BSD... Right, let me more specific. BCM4908 uses pkgtb firmware images. Those images contain: 1. bootfs (atf, u-boot, kernel, DTB files) 2. rootfs (filesystem) So when you flash BCM4908 firmware it always contains: 1. U-Boot and DTB for it 2. Kernel and DTB for it (+ more stuff) There isn't any on-flash DTB file that doesn't get updated when flashing a new image.