915G support

[Sid_key]

Hello, is 915G supported? Is it hard to implement support for Gigabyte
8i915md-g? Which motherboard dt take as base to adapt for it?

[Nico Huber]

Hi,

On 15.12.21 14:25, Sid_key wrote:
> Hello, is 915G supported?

alas not, and it never was, AFAICT. i945 is supported and i855 was once.
> Is it hard to implement support for Gigabyte
> 8i915md-g?

It very much depends on your skillset. It's not hard compared to a
modern mainboard. However, it could still take some months. Given
that there is code for newer and older Intel platforms available,
all the information needed to understand what needs to be done for
i915 should be public. Finding the exact sequence of bits to toggle
could be done with a tool like serialice[1]. Datasheets of that time
might also provide rather comprehensive register descriptions.

Beside the northbridge, you'd also need code for the CPU, the south-
bridge and likely a super-i/o. Your CPU might be supported, for the
southbridge it's roughly the same as for the northbridge, but easier.

Nico

[1] https://www.serialice.com/Main_Page

[Kyösti Mälkki]

On Fri, Dec 17, 2021 at 9:40 AM Nico Huber  wrote:
> Hi,
>
> On 15.12.21 14:25, Sid_key wrote:
> > Hello, is 915G supported?
>
> alas not, and it never was, AFAICT. i945 is supported and i855 was once.

I think I did a lot of the SerialICE development with 915G back in
2013(?).  in serialice tree you can find some support files for
Commell LV-672 and MSI MS-7133. I believe I had one or both of them
reach payload with coreboot, but I don't remember ever publishing that
work. I can check if I have those repositories somewhere in my
backups.

Kyösti

[Sid_key]

Thanks, I'll check them out.

пн, 20 дек. 2021 г., 11:35 Kyösti Mälkki :
> On Fri, Dec 17, 2021 at 9:40 AM Nico Huber  wrote:
> > Hi,
> >
> > On 15.12.21 14:25, Sid_key wrote:
> > > Hello, is 915G supported?
> >
> > alas not, and it never was, AFAICT. i945 is supported and i855 was once.
>
> I think I did a lot of the SerialICE development with 915G back in
> 2013(?).  in serialice tree you can find some support files for
> Commell LV-672 and MSI MS-7133. I believe I had one or both of them
> reach payload with coreboot, but I don't remember ever publishing that
> work. I can check if I have those repositories somewhere in my
> backups.
>
> Kyösti

[Kyösti Mälkki]

On Mon, Dec 20, 2021 at 9:35 AM Kyösti Mälkki  wrote:
> On Fri, Dec 17, 2021 at 9:40 AM Nico Huber  wrote:
> > Hi,
> >
> > On 15.12.21 14:25, Sid_key wrote:
> > > Hello, is 915G supported?
> >
> > alas not, and it never was, AFAICT. i945 is supported and i855 was once.
>
> I think I did a lot of the SerialICE development with 915G back in
> 2013(?).  in serialice tree you can find some support files for
> Commell LV-672 and MSI MS-7133. I believe I had one or both of them
> reach payload with coreboot, but I don't remember ever publishing that
> work. I can check if I have those repositories somewhere in my
> backups.

Hi, sorry for the delays.

The work is on three branches, i915-build, ich6-build and commell-build.
https://github.com/kmalkki/coreboot

From what I recall, booting-last-image branch was able to reach
payload, but no guarantees about that. It was probably only ever
tested with one type of a DIMM.

I did find bunch of serialice logs, but no coreboot console logs.

Regards,
Kyösti