[coreboot] Cold reset in Tyan s2912

[Roman Kononov]

I have difficulty cold-resetting Tyan s2912, which has mcp55.

The sequence
     outb(0x2,0xcf9);
     outb(0x6,0xcf9);
is a warm reset. It does not reset the HyperTransport link frequency and width.

The sequence
     outb(0xa,0xcf9);
     outb(0xe,0xcf9);
causes the CPU to hang but does not reset the MB.

Does anybody know what is wrong?

Thanks,
Roman