PMC551_DRAM_BLK3
pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dram_data);
pci_write_config_dword(dev, PMC551_DRAM_BLK3, dram_data);
pci_read_config_dword(dev, PMC551_DRAM_BLK3, &dcmd);