Configuring aspeed to use P2A Bridge

[Joel Stanley]

On Fri, 7 Jul 2023 at 07:13, Adrien Zinger <zinger.ad at gmail.com> wrote:
>
> Hello,
>
> I'm working with an ast2500 and I'm unsure about the required configuration to expose it as a graphic card.  I hope you can help me.
>
> Basically, I changed the device tree to enable the p2a and gfx. I have used two memory regions in the reserved-memory section for them (I don't know if there are any specific regions to choose). Do you know if some specific modifications here are mandatory ?

P2A is not required for graphics output.

GFX is the internal display device in the BMC. You can use it if you
want to show some output when the host is powered off, for example.

Using the BMC as a PCIe graphics device for the host is unrelated to
these two functions. We often refer to this as the "VGA" device.

I don't know what config you will need to change to get this working, sorry.

> I also heard about a possible configuration to open some windows and show up the ast2500 as a graphic card. I'm actively looking for which register to modify, do you have any advice ?
>
> Thank you in advance for your help. Sorry if I'm using the wrong mailing list.