Via VT82C686 (A/B) southbridge

[Jacek Chruscik]

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):

static void main(unsigned long bist)
{
    unsigned long x;

if (bist == 0) {
        early_mtrr_init();
    }
    enable_vt8231_serial(); //now it is called as: vt82c686_enable_serial
    uart_init();
    console_init();
.......

[Corey Osgood]

On Sat, Mar 22, 2008 at 11:43 PM, Jacek Chruscik 
wrote:
> 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
modification).

-Corey