GT_PCICFG_DATA
pcicfg_data = (uint32_t *)MIPS_PHYS_TO_KSEG1(GT_BASE + GT_PCICFG_DATA);
data = bus_space_read_4(pc->pc_bst, pc->pc_bsh, GT_PCICFG_DATA);
bus_space_write_4(pc->pc_bst, pc->pc_bsh, GT_PCICFG_DATA, data);
pcicfg_data = (uint32_t *)MIPS_PHYS_TO_KSEG1(GT_BASE + GT_PCICFG_DATA);