Booting eOS 8.1 ARM64 on Microsoft Windows on Arm Surface SDK Hardware

[svet-am]

I'd like to use eOS 8.1 arm64 with the Microsoft Windows Dev Kit 2023 (https://learn.microsoft.com/en-us/windows/arm/dev-kit/). This is essentially a Surface Arm in a desktop form factor. I am currently able to get to the main GRUB screen but from there my device just boot loops.

I have modified the boot arguments to remove both "quiet" and "splash". I get a little bit of messaging from the EFI environment but then the system just reboots.

I tried passing KERNEL_DEBUG boot argument as well as panic=0 to prevent the reboot and neither had an effect.

EFI stub: Booting Linux Kernel.... EFI stub: Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path EFI stub: Measured initrd data into PCR 9 EFI stub: Generating empty DTB EFI stub: Exiting boot services...

I'd really like to get this HW working with eOS so I'm willing to try debug steps if anyone has ideas.

[svet-am]

FWIW, I have also completely disabled Secure Boot and the behavior is the same.

[svet-am]

I was able to get a little bit further on my own. The current image appears to be missing the device tree for this hardware. There is a valid DTS for this hardware upstream in Linus' tree (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/qcom/sc8280xp-microsoft-blackrock.dts) . I compiled this DTS manually and injected it into the ISO. I then modified the boot script to load it using the GRUB devicetree command.

This got the kernel to boot further but now it hangs on a black screen (but doesn't reboot).

For anyone involved in this arm64 port, I'd like to know which hardware was it tested on. Was it ONLY Apple Silicon and RaspPi hardware?

[stsdc]

Try to ask on Discord: https://discord.gg/pCenUBu