Hi Mark,
On Wed, 08 Jan 2025 14:08:55 +0100, Mark Kettenis <mark.kette...@xs4all.nl> wrote: > > Have I miss something? Maybe here some magic that allows to discover > > everything on FDT tree? > > The ACPI information on these machines is barely usable. ACPI is just > not a very good match for these SoC based systems. Microsoft "solved" > that problem with PEPs, which are basically system-specific drivers > that encode a lot of information about the SoC and how it's actually > wired up in the machine in the driver itself. Basically it means you > have to write a customized driver for each system... And the > interfaces between PEP and ACPI are largely undocumented. > > So the way we support these systems on OpenBSD is that we require a > proper FDT for the machine. These FDTs are made available through the > arm64-qcom-dtb "firmware" package that is built from the > sysutils/firmware/arm64-qcom-dtb port. The way this is works is that > we have implemented some minimal ACPI support that is good enough to > run the installer. The installer will download the firmware package > and installs it. Upon the next boot, the bootloader will find the FDT > and load it before passing control to the kernel. > > So in order to properly support your system you need to: > > 1. Create an FDT for your system. I don't think this particular > system is supported by Linux yet, but it might be worth asking on > the #aarch64-laptops channel on the OFTC IRC server (irc.oftc.net) > if someone is working on it. If not, maybe ask mglocker@ for some > guidance; he created an FDT for his Samsung Galaxy Book4 Edge. > > 2. Add the FDT to the sysutils/firmware/arm64-qcom-dtb package. > > 3. Add an entry for your machine to the mapping table in > sys/arch/arm64/stand/efiboot/efiboot.c such that the FDT gets > loaded automatically. > Thanks for explanation, indeed I've missed something. I've jsut asked, no, here no one on that channel who working ok FDT. Marcus, may I kindly ask you about some guidance how to build FDT from scratch without any documentation (I can't find anything)? :) -- wbr, Kirill
