Ask HN: Can Linux terminal reside under BIOS?

To install any Operating System you need to get that OS in USB or hard disk. That seems like a very old school way. I am wondering if BIOS program can be rewritten to add basic Linux terminal feature in it so it can be used to pull Ubuntu or any other free resource from the internet without needing to install any other OS. Issue I am looking into,

I have read ROM is 4-8MB in size. Linux CLI is around 11MB. So need to chop down Linux CLI to make it under 2-6 MB since BIOS itself would be around 2 MB.

Do you guys think its a practical thing to make such a solution? Thanks