Hi folks, Adding Rob Herring to the thread, as he covers the DTB side in the Linux kernel.
>From the distros side, I am terrified at the prospect of requiring that dtbs >be embedded into the distros as a pre-requisite for a board to function. It >would represent a combinatorial mess (many platforms, many distros, many >versions) that would just hurt everyone in the long-term. Have I misunderstood >the intent of this proposal? Cheers, -- Steve Capper From: Heinrich Schuchardt <heinrich.schucha...@canonical.com> Date: Thursday, 2 May 2024 at 10:07 To: Pere Garcia <pere.gar...@arm.com> Cc: Humphreys, Jonathan <j-humphr...@ti.com>, boot-architecture@lists.linaro.org <boot-architecture@lists.linaro.org>, Vincent Stehle <vincent.ste...@arm.com> Subject: Re: OS provided DT proposal On 02.05.24 09:18, Pere Garcia wrote: > Hi Jon, > SystemReady IR owner here at ATG. May I ask, what would be the purpose > of DTB provided by the OS? The primary function (not only one) of DTB > from a SystemReady perspective is for the Platform (fw) advertise to the > OS what's in there, there are other secondary functions and some > vendors use DTB to store FW-only information or proprietary data > structures that do not break the interoperability to OSes. > Is such OS DTB containing platform information, or is this DTB > containing data useful for the OS or meaningful to be originated from > the OS ? can you please elaborate a bit? > > Thanks in advance, > Pere Device-trees are a mixture of hardware description and operating instructions for the kernel (e.g. baudrate of the UART, driver or host operating mode of a USB port). Device-tree overlays may be needed for optional hardware (e.g. Raspberry hats). Linux device-trees evolve over time. Full board support cannot be expected with an outdated device-tree provided by firmware. Furthermore both backward and forward incompatibilities occur from time to time. Using the device-tree matching the booted kernel typically provides the best user experience. Best regards Heinrich _______________________________________________ boot-architecture mailing list -- boot-architecture@lists.linaro.org To unsubscribe send an email to boot-architecture-le...@lists.linaro.org IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ boot-architecture mailing list -- boot-architecture@lists.linaro.org To unsubscribe send an email to boot-architecture-le...@lists.linaro.org
