[coreboot] AMD Family 15tn/16: What is `…HookGfxGetVbiosImage` needed for?

[Paul Menzel]

Dear coreboot folks,


why does AGESA need the Video BIOS hook for Family 15tn (Trinity) and
Family 16 (Kabini)?

        $ more src/northbridge/amd/agesa/family15tn/fam15tn_callouts.c
        […]
        AGESA_STATUS fam15tn_HookGfxGetVbiosImage(UINT32 Func, UINT32 FchData, 
VOID *ConfigPrt)
        {
                GFX_VBIOS_IMAGE_INFO  *pVbiosImageInfo = (GFX_VBIOS_IMAGE_INFO 
*)ConfigPrt;
                pVbiosImageInfo->ImagePtr = cbfs_get_file_content(
                                CBFS_DEFAULT_MEDIA, 
"pci"CONFIG_VGA_BIOS_ID".rom",
                                CBFS_TYPE_OPTIONROM);
                /* printk(BIOS_DEBUG, "IMGptr=%x\n", 
pVbiosImageInfo->ImagePtr); */
                return pVbiosImageInfo->ImagePtr == NULL ? AGESA_WARNING : 
AGESA_SUCCESS;
        }

Looking through

        src/vendorcode/amd/agesa/f15tn/Legacy/Proc/agesaCallouts.c

I do not see what this is needed for.


Thanks,

Paul

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