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On 1/12/26 15:42, Mark Millard wrote: > On 1/12/26 15:33, Mark Millard wrote: >> On 1/12/26 15:09, Mark Millard wrote: >>> On 1/12/26 12:57, Gabe Bauer wrote: >>>> Hello, community! I am reaching out because I have a Thinkpad X13s with >>>> a Snapdragon 8cx Gen 3 SoC. I have been unable to get any operating >>>> system to work so far on this machine. I have done a fair amount of >>>> coding and debugging in C. However, I have never ported an operating >>>> system before. I am in my senior year at university and I would like to >>>> undertake this as a project. I have an x86_64 machine running FreeBSD >>>> which I can use to help me in this endeavour. However, since I have >>>> never done this before, I lack the domain specific knowledge on what I >>>> will need in order to be successful. Any tips on how to get started >>>> would be greatly appreciated. Thank you very much!! >>> >>> >>> Well, the Windows Dev Kit 2023 used(/uses) a Snapdragon 8cx Gen 3 SoC >>> and has a UEFI/ACPI that FreeBSD boots just fine. But FreeBSD does not >>> support the 2 USB-C ports in the result. It does support the 3 USB-A >>> ports, including booting from USB-A ports. (Some UEFI configuration >>> required to make that the default. I leave the internal drive with >>> Windows 11 Pro, forming the local Windows on aarch64 example when booted >>> that way.) >>> >>> But, in the FreeBSD based Dev Kit 20023 context, the UEFI/ACPI that is >>> built-in has the Snapdragon 8cx Gen 3 SoC related magic in it instead of >>> in the FreeBSD kernel, if I understand right. >>> >>> The UEFI/ACPI source code is not public as far as I know. >>> >>> >>> The Snapdragon 8cx Gen 3 SoC presents as having: >>> >>> 4 Cortex-A78C >>> and >>> 4 Cortex-X1C >>> >>> >>> FreeBSD does report the following relative to the ACPI and what FreeBSD >>> does not handle: >>> >>> ACPI Error: AE_NOT_FOUND, While resolving a named reference package >>> element - \134_SB_.UBF0.PRT0 (20251212/dspkginit-605) >>> ACPI Error: AE_NOT_FOUND, While resolving a named reference package >>> element - \134_SB_.UBF0.PRT1 (20251212/dspkginit-605) >>> . . . >>> ACPI Warning: \134_SB.GPU0._CLS: Return Package is too small - found 1 >>> elements, expected 3 (20251212/nsprepkg-511) >>> can't fetch resources for \134_SB_.ADC1 - AE_AML_INVALID_RESOURCE_TYPE >>> acpi0: Could not update all GPEs: AE_NOT_CONFIGURED >>> >>> The 2 "ACPI Error" messages may well be tied to the 2 USB-C ports. >>> >>> >> >> Looking around, the following are the commits that reference the Windows >> Dev Kit 2023. The older ones may give hints at what was required to get >> the FreeBSD kernel to boot based on the UEFI/ACPI involved. >> >> >> Commit message >> Author Age Files Lines >> Commit URL >> >> lib/libmd: add optimised SHA1 implementations for aarch64 >> Robert Clausecker 2025-05-14 2 -0/+514 >> https://cgit.freebsd.org/src/commit/?id=f6210541f9e3c6cfda321e0ad98f277fb98a625b >> >> libc/aarch64: fix strlen() when flush-to-zero is set >> Robert Clausecker 2025-01-16 1 -2/+1 >> https://cgit.freebsd.org/src/commit/?id=521c1fe0e2002dfd7d8db86eb7144b7865229912 >> >> arm64: Enable the Hyper-V keyboard driver >> Andrew Turner 2023-06-21 1 -0/+2 >> https://cgit.freebsd.org/src/commit/?id=3a1bfe881a24a76ff8d6406476461924a027ea8a >> >> arm64: Disable PAC when booting on a Windows Dev Kit 2023 >> Mark Johnston 2023-04-23 1 -1/+30 >> https://cgit.freebsd.org/src/commit/?id=4b39a12830feaf2ac49b157ed079c04114b1a3ca >> >> Add CPU Ident for Qualcomm Kryo 400 (used in MS Dev Kit) >> Allan Jude 2023-01-18 2 -1/+14 >> https://cgit.freebsd.org/src/commit/?id=fd5e9210598cfafbecc05b5ec03da25483833f90 >> >> Add the fixed memory type to the pci ecam driver >> Andrew Turner 2023-01-18 1 -3/+20 >> https://cgit.freebsd.org/src/commit/?id=896f556205c8d87ef842dc844752daa7d2385336 >> >> loader.efi: make sure kernel image is executable >> Robert Clausecker 2023-01-05 1 -4/+4 >> https://cgit.freebsd.org/src/commit/?id=95fa2e0aee5b7259cf4bcdea7396c4dff3241173 >> >> Add Windows Dev Kit 2023 support to if_ure >> Andrew Turner 2023-01-04 2 -0/+2 >> https://cgit.freebsd.org/src/commit/?id=e5b9b5ee8c3a4f3bff348cd94e3555e6b69585f6 >> >> Check for more XHCI ACPI IDs >> Andrew Turner 2023-01-04 1 -4/+7 >> https://cgit.freebsd.org/src/commit/? >> id=8793196ca28f7b78f04ca479fe60b7d7af6b20e1 >> >> > > I see that last URL ended up split. Trying an alternate notation to see > if it avoids that: > > <https://cgit.freebsd.org/src/commit/?id=e5b9b5ee8c3a4f3bff348cd94e3555e6b69585f6>; > > Not my day, trying for the right URL this time . . . <https://cgit.freebsd.org/src/commit/?id=8793196ca28f7b78f04ca479fe60b7d7af6b20e1>; -- === Mark Millard marklmi at yahoo.comhome | help