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Jerkmate
https://docs.kernel.org/filesystems/ramfs-rootfs-initramfs.html
Ramfs, rootfs and initramfs — The Linux Kernel documentation
linux kernel documentationrootfsinitramfs
https://tonym.us/porting-alpine-linux-rootfs-wsl2.html
Lightweight Efficiency: Porting Alpine Linux RootFS to WSL2 // Tony Metzidis
alpine linuxtony metzidislightweightefficiencyporting
https://xdaforums.com/t/build-kernel-from-source-and-boot-to-ubuntu-using-l4t-linux-for-tegra-rootfs.3274632/page-2
Build kernel from source and boot to Ubuntu using L4T (Linux for Tegra) rootfs | Page 2 | XDA Forums
Jul 6, 2021 - Update (08/26/2017) Update: I updated my SATV Pro 2015 to ROM 5.x, I did not have to replace dtb file. The img files from link below seem still working...
2 xda forumsubuntu usingbuildkernelsource