Arch

This is the method I used to install Arch on the yoga slim 7x. This is from memory so I may have forgotten things

prerequisites

Download the Debian 12 image from https://git.codelinaro.org/linaro/qcomlt/demos/debian-12-installer-image
write it to USB, use gparted to resize the partition
download the latest (ancient) arch linux arm generic image from https://archlinuxarm.org/platforms/armv8/generic
unpack the initrd and add this tarball
also add some tools like mkfs.ext4 and fdisk (I downloaded debian 12 versions and unpacked the necessary libs and binaries)
boot from the USB (use F12)
once in installer, press Fn+alt+F2 to get to another TTY
create a wpa_supplicant file and start wpa_supplicant
back on tty1, continue the installer until it has setup networking
return to tty2
create /boot and / partitions (and any other you want)
mount / on /mnt
unpack the tarball into /mnt
mount /boot on /mnt/boot
bind mount /sys, /dev, /proc and /run in /mnt
chroot in /mnt
set the date with the date command (otherwise signature verification fails)
use

pacman-key --init
pacman-key --populate archlinuxarm

update with pacman -Syyu
copy kernel, initrd and device tree from the USB
do the rest of Arch setup
do some of the steps outlined by linaro, in particular the zink environment
exit the chroot
edit the USB grub to load from the nvme
reboot with F12 and boot from the nvme
build newer kernel, initrd and dtb
get firmware from https://github.com/Seraphin-/linux-firmware-x1e80100-lenovo-yoga-slim7x

I replaced the windows nvme with a bigger one that has only linux, that way I was able to update the UEFI boot manager to load Arch without the USB stick
- Download shellaa64.efi and place it on USB stick
- use the following grub entry:
```
menuentry "UEFI Shell" {
  insmod fat
  insmod chain
  search --no-floppy --set=root --file /shellaa64.efi
  chainloader /shellaa64.efi
}
```
- boot to UEFI shell
- use the commands in the debian 12 image explanation to set Arch as first boot entry
install mesa from this PKGBUILD https://github.com/joske/PKGBUILDs-x1e/tree/master/mesa