Extremely interesting
Of course you should upload the source code (of the kernel, device tree definitions, U-Boot, etc.) somewhere in public, tangrs

Note that a Linux port for the Clickpad series would be even much more interesting than a port for the CX series, because on the Clickpad series, it is certainly possible to install Linux permanently (because it is definitely possible to change the contents of the boot1), and thereby be completely free of whatever lockdown TI will try - and fail, as usual - to put forth (instead of embracing developers and making its calculator more useful as a result)

And indeed, CAS vs. non-CAS (especially on the CX, which does not have interchangeable keyboards) is, for all practical purposes, only a difference of several bits in the ASIC ("CAS bit" and two leading hex digits of the product ID), as shown by RunOS (never released, in 2010) and OSLauncher (independently reimplemented, and released, in 2011).

I assume that you've watched the videos and read the documentation ?

When Linux has booted, init has run and you've got a shell, you type commands like you can do on other Linux platforms
(nowadays, most users don't use the terminal on desktop or mobile Linux)