Re: Is there a way to enable a PCI-PCI bridge on bus 3 early?

Nico Huber via coreboot <[email protected]>
Newsgroups gmane.linux.bios
Message-ID <[email protected]>
On 11.01.24 14:43, Nico Huber via coreboot wrote:
> On 11.01.24 07:03, Keith Hui wrote:
>> However, I lost integrated graphics completely. A boot log is
>> attached.
>
> I fear it is not. Did you forget the attachment?

Found it now. It says early in ramstage:

  [INFO ]  PCI: Static device PCI: 00:02.0 not found, disabling it.

So that's definitely an issue. But I really can't imagine
how this is happening, and why this particular device. As I
understand the hardware, all the decoding settings in the PCH
shouldn't affect the northbridge devices.

There's more

  [DEBUG]  IGD decoded, subtracting 160M UMA and 0M GTT

0M isn't a good idea. This just prints what register settings
were found. Those were probably set in romstage (compiled into
bootblock with your settings if I interpreted the log correctly).

It looks all very odd and alas I have no clue how it could relate
to the subtractive-decode settings.

Nico

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