I have created an arm64 rootfs for Slackware and just need to test it.
I am writing documentation on my website.
I use Debian 12 on VMware fusion on my mac Studio to compile u-boot and the kernel as well as chroot to the created rootfs for fine tuning.
I should have working micro SD card for both Slackware and ArchLinux within the next few days.
My next targets will be the Beaglebone AI 64 and then some riscv64 boards.