Re: [coreboot] flashrom on MCP73

[Fabrício Ceolin]

Hi,

On Wed, Jan 14, 2009 at 9:36 PM, Peter Stuge  wrote:
> Hi,
>
> Fabrício Ceolin wrote:
> > We are trying to make flashrom work on
>
> http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?detailid=858&a...
> > Chipset MCP73 / SIP chipset Macronix MX25L8005.
> >
> > We made modifications using a enable_flash_mcp55 function, but
> > does't work.
>
> ..
> > How can I do works?
> >
> > Are there any hints?
>
> It's not that easy.
>
> First you have to figure out what chip is the SPI bus master. I
> suggest powering off the board and using a continuity tester to check
> if most flash chip pins are connected to the superio chip. (The
> superio is the chip between the PCI slots and the CMOS battery. It
> may have an AMI BIOS sticker on it, just peel that off and look at
> what is etched underneath.)

We made these tests. There are a superio, but the bios chip isn't connect to
it.
The bios chip is directly connected to the chipset MCP73.

So, I need to the datasheet of MCP73 to implement it.

Anybody have a MCP55 spec? Maybe is likely!

Thanks!
> If there are no connections you're out of luck, because then the
> MCP73 is the SPI bus master and there's little to no chance of
> getting documentation from NVIDIA.
>
> However, if the superio is the SPI bus master it should be possible
> to get flashrom working. In this case please check which part number
> your superio chip has. I found no good enough photos of the board
> online to tell what it is, but the logo looks a little like Winbond.
> I have a patch for Winbond superio SPI master support but it's a
> little old by now and probably doesn't apply cleanly. It would have
> to be fixed up, but it worked fine when I wrote it.
>
> http://stuge.se/fr.wbsio_spi.d201gly.patch
>
> Very likely you will also need a board enable routine for this
> mainboard.
>
> //Peter