[coreboot] [newbie] support for GA-M57SLI-S4 and AMD Phenom (K10) possible?

[Marc Jones]

Carl-Daniel Hailfinger wrote:
> On 28.07.2008 22:34, Marc Jones wrote:
>> Peter Stuge wrote:
>>> On Mon, Jul 28, 2008 at 01:13:43PM -0600, Marc Jones wrote:
>>>> There is FAM10 (K10) support in coreboot. The platform would need
>>>> to be ported to the Fam10 code. I would be happy to assist anyone
>>>> who would like to do the port.
>>> Does the Fam10 code also handle K8 or would there be one coreboot
>>> target for m57sli+k8 and one for m57sli+fam10 ?
>>>
>> There needs to be one for each. The fam10 code has some significant
>> differences.
> 
> Would it be possible to support both K8 and K10 in one image? I gather
> that the code is not entirely different, so sharing some stuff may be
> possible.
> The big issue I see is CAR setup. I can code up a version of the CAR
> code which has no ifdefs and handles both family 0Fh and family 10h.
> That depends on whether there's a short code sequence not using too many
> registers which can detect family 10h presence. AFAICS CPUID always
> clobbers EAX,EBX,ECX,EDX, so we need to have that sequence quite early
> and store the result somewhere.

The CPUs are socket compatible but they are a generation apart. The MC, 
HT and much of the CPU init are different. You would need complete 
versions of all the init for both families and the runtime checking on 
what path to take. Basically, you have two BIOS in one. I don't know if 
that is the right thing to work on but I guess if you are motivated.... 
patch away.

Marc



-- 
Marc Jones
Senior Firmware Engineer
(970) 226-9684 Office
mailto:Marc.Jones at amd.com
http://www.amd.com/embeddedprocessors