[LinuxBIOS] retrieving MAC from romstrap

[Robert Millan]

Hi!

I just run through this piece of code in southbridge/nvidia/ck804/ck804_nic.c,

unsigned long mac_pos;
    	mac_pos = 0xffffffd0; // refer to romstrap.inc and romstrap.lds
    	mac_l = readl(mac_pos) + nic_index;
    	mac_h = readl(mac_pos + 4);

and can't understand what is this romstrap and why it retrieves the MAC from
it in runtime.  Is this some kind of legacy interface?  Wouldn't it be simpler
to just hardcode it during build?  E.g. see attached patch.