Are there any related documents / books for this template?

[letrandat]

Do we have anything other than the "https://github.com/makelinux/ldt/blob/master/README.md"?

[smalinux]

@letrandat Try to ask on forum.osdev may you get a response.

[makelinux]

There is no specific documentation for the template except of comments in the sources.

[makelinux]

https://en.wikibooks.org/wiki/The_Linux_Kernel