[coreboot] Attempt to porting coreboot to Gigabyte ga-945gcm-s2l

[Arthur Heymans]

Zoran Stojsavljevic <zoran.stojsavljevic at gmail.com> writes:

> Hello Arthur,
>
> CPUID 1067x? Penryn?
> https://en.wikipedia.org/wiki/Penryn_(microprocessor) ?!
This is indeed the cpu which I used to run tests with. This board should
also work with older LGA775 cpu I think. (even though coreboot has
problems with CAR on this P4 HT 630 I also tried)


> It is long time off any radar screen for INTEL IOTG support, I can tell to you this... Started production in 2007! :-(( WTH you need Coreboot on this one?
What is INTEL IOTG support?

> "The WBINVD instruction is a privileged instruction. When the processor is running in protected mode, the CPL of a program or procedure must be 0 to
> execute this instruction. This instruction is also a serializing instruction (see "Serializing Instructions" in Chapter 8 of the IA-32 Intel Architecture Software
> Developer's Manual, Volume 3)."
>
> Question to you: do you execute this instruction (WBINVD) in Ring 0 (kernel) mode? If you do, and it still hangs, I have for you a good suggestion: try to replace
> WBINVD with INVD and see if you'll hang (simple logic stands behind
> what I read there:
> http://x86.renejeschke.de/html/file_module_x86_id_325.html).
No idea, but I can certainly try it.


> If you hang: your problem is for sure/100% NOT raminit (in other words MRC);
> If you do NOT hang, and continue: raminit (MRC) might be (but not
> certainly???) your problem. If you hang later (while accessing DDRAM),
> then it is obvious! ;-)
What I don't understand is that this is just southbridge code which is
used by other boards too and that this instruction causes no issues to
those other boards in the coreboot tree (like thinkpad x60).

Having read all the i945 raminit code (this is not MRC but native
coreboot code AFAIK) it does seem to be written with 667MHz fsb (945gm
laptops like thinkpad x60)and 533MHz fsb (945gc inteld945gclf) in mind.
So I will soon try to confirm this theory with 533MHz fsb cpu.
>
> Good luck with this one,
> Zoran

Kind regards
-- 
Arthur Heymans