<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - DRM / KMS bootup error on VX900 platform" href="https://bugs.freedesktop.org/show_bug.cgi?id=94473#c25">Comment # 25</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - DRM / KMS bootup error on VX900 platform" href="https://bugs.freedesktop.org/show_bug.cgi?id=94473">bug 94473</a> from <a class="email" href="mailto:kevinbrace@gmx.com" title="Kevin Brace <kevinbrace@gmx.com>"> Kevin Brace</a> <pre>(In reply to HuangRan from <a href="show_bug.cgi?id=94473#c22">comment #22</a>) Hi Frank, > With further kernel debugging, we found that in via_driver_load() function, > it has the code as below: > #if __OS_HAS_AGP > if ((dev_priv->engine_type > VIA_ENG_H2) || > (dev->agp && drm_pci_device_is_agp(dev))) { > ret = via_detect_agp(dev); > if (!ret) > via_agp_engine_init(dev_priv); > else > DRM_ERROR("Failed to allocate AGP\n"); > } > #endif > > Actually dev->agp is NULL for VX900. But because dev_priv->engine_type value > is greater than VIA_ENG_H2, via_detect_agp() is called. > I am not sure what does engine_type mean? Can anybody give some comments? > And why is it related to AGP detect? > > Thanks, > Frank I think (dev_priv->engine_type > VIA_ENG_H2) means K8M890 or later (i.e., The integrated graphics is Chrome 9 or later 3D engine.). It appears that K8M890 was the first chipset to implement Chrome 9 graphics. Chrome 9 graphics' 3D engine is rumored to be borrowed from S3 Graphics DeltaChrome. DeltaChrome is a 130 nm process AGP graphics chip that came out in 2003 / 2004. A few vendors sold graphics card based on it. It is very rare to find, but I do own one copy of it (It was made by VIA Technologies itself.).</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>