Comment by eqvinox
2 months ago
My sweet summer child… this is backwards compatibility to the I/O register set of NatSemi/Intel's 8250 UART chip…
…from 1978.
https://en.m.wikipedia.org/wiki/8250_UART
The definitions are correct, look up an 16550 datasheet if you want to lose some sanity :)
Oh damn, thanks!