X Segmentation fault with i810

Chris Wilson chris at chris-wilson.co.uk
Tue Jan 3 09:49:35 PST 2012

On Tue, 03 Jan 2012 12:02:43 -0500, Adam Jackson <ajax at redhat.com> wrote:
> On 12/30/11 12:34 AM, Jeff Chua wrote:
> > How can I go about to help debug this?
> The i810 driver probably needs the equivalent fix as:
> http://cgit.freedesktop.org/xorg/driver/xf86-video-cirrus/commit/?id=f422d0c38b0befdb2152215ab05d0d14f3da3ed9

The i810 driver uses vgaHWSetMmioFuncs() rather than SetStdFuncs, and so
leaves hwp->io uninitialised. That pointer is then dereferenced by
DACDelay() (as it uses pci_io_read8 irrespective of mmio/std funcs) during
the vgaHWSaveColormap(). At which point, I'm far beyond my comfort zone...

Chris Wilson, Intel Open Source Technology Centre

More information about the xorg mailing list