> > how to tell netbsd what clockrate is? 
> > with my 8-port serial everything works fine but i have to enter 4 times
> > smaller speed that i want, because it have 7.3728Mhz clock (460800 max
> > speed, not 115200) but netbsd assumes it's 1.843Mhz (115200 max)
> 
> What exact board is it ?
Titan VS-800+ ISA
> I added code to solve this problem recently.

it cannot be autodetected (ISA card, no device ID's). 
should be selectable like this:

comx at isax port xxx irq x speed yyyyy
                            ^^^^^^^^