Re: PCI IO ECS access is no longer possible for AMD family 17h

[Pali Rohár]

On Tuesday 15 July 2025 12:43:16 Rostyslav Khudolii wrote:
> >
> > Yes, I would like to get access to ECS via CF8/CFC direct IO for
> > debugging purposes, even though MMCFG is enabled and used.
> >
> > If you can send me a simple patch or any sample / idea how to do it,
> > I would be very happy. I was not able to figure out how to enable ECS
> > over CF8/CFC.
> >
> 
> Hi Pali,
> I'm sorry for the late reply.
> 
> If I understand your request correctly, all you need to do  is patch
> the pci_enable_pci_io_ecs() function to use
> the different register to set EnableCF8ExtCfg: D18F4x044.
> 
> Regards,
> Ros

Hello, thank you for information.

Just I would like to know, where did you find information that the
EnableCF8ExtCfg register was moved to D18F4x044? It is documented in
some AMD specification?

I did not find anything regarding this change.

Pali