[coreboot] Via VT82C686 (A/B) southbridge

Corey Osgood corey.osgood at gmail.com
Sun Mar 23 05:56:59 CET 2008

On Sat, Mar 22, 2008 at 11:43 PM, Jacek Chruscik <mercury at wirebros.com>

> Hi,
> Does anybody know how to deal with this southbridge: VIA VT82c686
> I'm trying to port coreboot v.2 for FIC FR33E motherboard, but this
> southbridge has the superio built in.
> I don't have any datasheet for this chip.
> coreboot-v2 has no option for such superio, and all I need to do is to
> initialize serial port.
> As a base I used via-epia code. The north is vt8601.
> So far I generated PIRQ table, modified auto.c to recognize correct
> southbridge, modified config.lb to initialize devices.
> There is serial init function in vt82c686 source:
> static void vt82c686_enable_serial(device_t dev, unsigned iobase)
> .....
> but it requires 2 parameters, which I don't have  (called as early
> serial init from auto.c):

dev is the ISA/LPC device in the southbridge, with device ID 0x0686. iobase
is the serial io base, usually 0x3f8 for the first port, and 0x2f8 for the
second one (although I doubt the second one will work, without some

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