On Mon, Feb 11, 2019 at 12:34 PM Enrico Weigelt, metux IT consult < [email protected]> wrote:
> Hi folks, > > > I'm currently writing Linux drivers for AMD FCH GPIO. It's currently > running fine on an APUv2 board (based on some examples I've found in > the net, including coreboot APUv2 code) but for mainline it should be > more generic. Yet lacking automatic probing / configuration (don't > like hardcoding so much) > > My problem now is finding out which FCH it is exactly and find the > corresponding specs. There seem to be two FCH types: Bolton and > hudson. > And Yangtze, Avalon, Kern, ... > For Bolton, I've found some specs that seem to fit, but other sites > indicate, the GX-412TC had an Hudson - unfortunately didn't find > any register specs for this one yet > Well coreboot tree has these names somewhat wrong, and mostly just call them Hudson. In GX-412TC codename was probably Avalon. > Does anybody here have some more detailed information on that ? > Usually, AMD BKDG papers have the info you are after, for pcengines/apu2 variants: https://www.amd.com/system/files/TechDocs/52740_16h_Models_30h-3Fh_BKDG.pdf <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwipkNGKwLPgAhVGUZoKHepUBv8QFjABegQIAxAC&url=https%3A%2F%2Fwww.amd.com%2Fsystem%2Ffiles%2FTechDocs%2F52740_16h_Models_30h-3Fh_BKDG.pdf&usg=AOvVaw0OHMcKQWVAQkya7W-FCnPQ> Often it was PCI 0:14.3 (LPC bridge) register 08h (REVISION_ID) you can identify FCH silicon from. HTH, Kyösti
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