setserial seems to be fine:
In V1 the file to modify is src/superio/via/vt1211/setup_serial.inc That code sets up ttyS0 which is the VT1211's logical device 2. You want to add some similiar code for logical device 3 to get ttyS1 working.
Assuming you want it to be at 2f8 you'd merge in these lines: OUTPNPADDR($7) OUTPNPDATA($3) /* set the enable in reg. 0x30 */ OUTPNPADDR($0x30) OUTPNPDATA($0x1)
/* Serial Port 2 Base Address (BEh) */ OUTPNPADDR($0x60) OUTPNPDATA($0xbe) /* Serial Port 2 IRQ (03h) */ OUTPNPADDR($0x70) OUTPNPDATA($0x3) /* Serial Port 2 Control */ OUTPNPADDR($0xf0) OUTPNPDATA($0x2)
...then do the turn off pnp /* turn off PnP */ OUTPNPADDR($0xaa)
...then duplicate the serial setup except the address goes from 3f8 -> 2f8
That should do it.
-Dave