> 
> Maybe you can tell us what warning you get that you want to get rid of?

I am sorry about.
i8251.c:28: warning 59: function 'getchar' must return value

> 
> That being said, when the complete function is written in asm you probably
> want to use the __naked keyword to suppress the red tape.

And that does exactly what I wanted!  Thank you.

Did I miss this in the documentation?
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