temp = RS690_READ_MCIND(dev_priv, RS690_MC_GART_FEATURE_ID);
                RS690_WRITE_MCIND(RS690_MC_GART_FEATURE_ID, 0x42040800);
 
-               RS690_WRITE_MCIND(RS690_MC_GART_BASE,
-                                 dev_priv->gart_info.bus_addr);
+               temp = dev_priv->gart_info.bus_addr & 0xfffff000;
+               temp |= (upper_32_bits(dev_priv->gart_info.bus_addr) & 0xff) << 4;
+               RS690_WRITE_MCIND(RS690_MC_GART_BASE, temp);
 
                temp = RS690_READ_MCIND(dev_priv, RS690_MC_AGP_MODE_CONTROL);
                RS690_WRITE_MCIND(RS690_MC_AGP_MODE_CONTROL, 0x01400000);