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SubjectRe: [PATCH] Add the ability to layer another driver over the serial driver
> there as "protocols" for user-tty interfaces, i.e., you need a user, that 
> opens a tty, sets a line discipline to it, and does io (read/write) over
> it, and NOT to be completely initialised and driven from the kernel.

Take a look at the SLIP driver. User space sets up the port but all the
actual I/O is to/from the kernel not via user space.
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