pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);