>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
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