How to build SeaBIOS as CSM for Tianocore?

[Rafael Send]

Hi all-
I've found only vague references to doing this (
https://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support...),
and no real guides / examples.

Before I go on a wild goose chase, has anyone tried this before?

I've tried the other way around, loading DUET from SeaBIOS, but all I get
is a brief message that's too short to read properly (but it looks like
it's loading memory locations, didn't see any errors), then I land back at
SeaBIOS.

Any pointers would be appreciated!
Cheers,
R

[Gerd Hoffmann]

On Fri, Aug 16, 2019 at 04:31:16PM -0700, Rafael Send wrote:
> Hi all-
> I've found only vague references to doing this (
> https://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support...),
> and no real guides / examples.
>
> Before I go on a wild goose chase, has anyone tried this before?

Basically compile with CONFIG_CSM=y, then copy the binary into the EDK2
tree and build ovmf with -D CSM_ENABLE.

https://git.kraxel.org/cgit/jenkins/seabios/tree/seabios.git.spec
https://git.kraxel.org/cgit/jenkins/edk2/tree/edk2.git.spec.template

HTH,
  Gerd

[Rafael Send]

Right, but I'm not building for OVMF, I'm making a Coreboot payload.

Does that option still exist there?

Rafael

On Mon, Aug 19, 2019 at 12:39 AM Gerd Hoffmann <[e-mail]> wrote:
> On Fri, Aug 16, 2019 at 04:31:16PM -0700, Rafael Send wrote:
> > Hi all-
> > I've found only vague references to doing this (
>
> https://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support...
> ),
> > and no real guides / examples.
> >
> > Before I go on a wild goose chase, has anyone tried this before?
>
> Basically compile with CONFIG_CSM=y, then copy the binary into the EDK2
> tree and build ovmf with -D CSM_ENABLE.
>
> https://git.kraxel.org/cgit/jenkins/seabios/tree/seabios.git.spec
> https://git.kraxel.org/cgit/jenkins/edk2/tree/edk2.git.spec.template
>
> HTH,
>   Gerd

[Matt DeVillier]

CorebootPayloadPkg doesn't have the hooks requires for CSM, you'd need to
use OMVH as a model to integrate the CSM. I've played around with it but
never got it working. Maybe it would be better to try and integrate with
UefiPayloadPkg?

On Mon, Aug 19, 2019, 4:14 PM Rafael Send <[e-mail]>
wrote:
> Right, but I'm not building for OVMF, I'm making a Coreboot payload.
>
> Does that option still exist there?
>
> Rafael
>
> On Mon, Aug 19, 2019 at 12:39 AM Gerd Hoffmann <[e-mail]> wrote:
> > On Fri, Aug 16, 2019 at 04:31:16PM -0700, Rafael Send wrote:
> > > Hi all-
> > > I've found only vague references to doing this (
> >
> > https://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support...
> > ),
> > > and no real guides / examples.
> > >
> > > Before I go on a wild goose chase, has anyone tried this before?
> >
> > Basically compile with CONFIG_CSM=y, then copy the binary into the EDK2
> > tree and build ovmf with -D CSM_ENABLE.
> >
> > https://git.kraxel.org/cgit/jenkins/seabios/tree/seabios.git.spec
> > https://git.kraxel.org/cgit/jenkins/edk2/tree/edk2.git.spec.template
> >
> > HTH,
> >   Gerd
> >
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