[coreboot] Ivy Bridge desktop support

Aaron Durbin adurbin at chromium.org
Tue Apr 2 19:12:43 CEST 2013

On Tue, Apr 2, 2013 at 11:56 AM, Nico Huber <nico.h at gmx.de> wrote:
> Hello Paul,
> Am 02.04.2013 11:12, schrieb Paul Menzel:
>> Am Sonntag, den 31.03.2013, 21:10 +0200 schrieb Paul Menzel:
>>> Am Samstag, den 30.03.2013, 19:57 +0100 schrieb Nico Huber:
>>>> I'm looking forward to write a port for my Ivy Bridge desktop system based
>>>> on this board: Intel DH77EB (codenamed Eb Lake, [1]). It comes with the H77
>>>> platform controller hub (PCH) and a Winbond W83677HG super I/O chip (build
>>>> by Nuvoton as NCT6775F, [2]). I'm using it with a Core i3-3225 processor [3].
>>> awesome news! Best luck with this!
>>>> I've got the datasheet for the super I/O, so writing support for it should
>>>> be no problem.
>>> The ASRock E350M1 [4] also uses the Nuvoton NCT6775F. Currently the code
>>> from the Winbond W83627HF [5].
>>>     device pci 14.3 on # LPC        0x439d
>>>         chip superio/winbond/w83627hf
>>> Serial works for me. The only problem that might be related from any
>>> incompatibilities is, that a PS/2 keyboard connected to the shared PS/2
>>> port does not work correctly, meaning, entering a character the
>>> characters is displayed several times more. Entering »n«, I get
>>> »nnnnnnnn« for example. Alvaro, having a ASRock E350M1/USB3, also uses a
>>> PS/2 keyboard *but* has no problems with this at all. So I have no idea
>>> if this is related to the Super I/O or not.
> Sounds weird. But something I can't test / run into: My board doesn't even
> have a PS/2 port.
>> Please note that Martin Roth pointed out to me, that when looking at the
>> the ASRock E350M1, one actually finds that the Nuvoton NCT5572D is used.
>> Both superiotool and Linux’ w83627ehf are incorrect.
>>         superiotool r4.0-3888-gce9f8be
>>         Found Nuvoton NCT6775F (B) (id=0xb473) at 0x2e
>> And if you know what you have to look for, you also find that this was
>> known all time along [8].
>>         The board has a socketed SPI flash BIOS chip and a serial port
>>         header. The SIO is Nuvoton NCT5572D. Using coreboot's existing
>>         Winbond w83627hf is a good enough match to get the serial port
>>         and keyboard working.
> Uh, does this mean that both chips share the same ID? I get the same output
> from superiotool:
>     Found Nuvoton NCT6775F (B) (id=0xb473) at 0x2e
> My chip is labeled W83677HG and I vaguely remember that I saw on a web page
> that this is a NCT6775F. But I can't find the page anymore :(
> Also, W83677HG sounds more like NCT6775F than NCT5572D.

They are probably the same chip. http://en.wikipedia.org/wiki/Nuvoton
Nuvoton was spun off from Winbond a few years ago. It's all just
branding and part number differences, I suspect.


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