Index: linux-core/mga_drv.c
===================================================================
RCS file: /cvs/dri/drm/linux-core/mga_drv.c,v
retrieving revision 1.49
diff -u -d -r1.49 mga_drv.c
--- linux-core/mga_drv.c	9 Nov 2004 16:58:02 -0000	1.49
+++ linux-core/mga_drv.c	9 May 2005 21:52:50 -0000
@@ -37,6 +37,8 @@
 
 #include "drm_pciids.h"
 
+static int mga_driver_open_helper(drm_device_t * dev, drm_file_t * filp_priv);
+
 static int postinit(struct drm_device *dev, unsigned long flags)
 {
 	dev->counters += 3;
@@ -82,6 +84,7 @@
 	    DRIVER_IRQ_VBL,
 	.pretakedown = mga_driver_pretakedown,
 	.dma_quiescent = mga_driver_dma_quiescent,
+	.open_helper = mga_driver_open_helper,
 	.vblank_wait = mga_driver_vblank_wait,
 	.irq_preinstall = mga_driver_irq_preinstall,
 	.irq_postinstall = mga_driver_irq_postinstall,
@@ -134,3 +137,31 @@
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL and additional rights");
+
+int mga_driver_open_helper(drm_device_t * dev, drm_file_t * filp_priv)
+{
+	const struct pci_dev * const pdev = dev->pdev;
+
+
+	/* There are PCI versions of the G450.  These cards have the
+	 * same PCI ID as the AGP G450, but have an additional PCI-to-PCI
+	 * bridge chip.  We detect these cards, which are not currently
+	 * supported by this driver, by looking at the device ID of the
+	 * bus the "card" is on.  If vendor is 0x3388 (Hint Corp) and the
+	 * device is 0x0021 (HB6 Universal PCI-PCI bridge), we reject the
+	 * device.
+	 */
+	
+	if ( (pdev->device == 0x0525)
+	     && (pdev->bus->self->vendor == 0x3388)
+	     && (pdev->bus->self->device == 0x0021) ) {
+#if defined( __powerpc__ )
+		DRM_ERROR("GXT135p is not yet supported\n");
+#else
+		DRM_ERROR("PCI G450 is not yet supported\n");
+#endif
+		return -ENODEV;
+	}
+
+	return 0;
+}