DC_DC8051_CFG_EXT_DEV_0
write_csr(dd, DC_DC8051_CFG_EXT_DEV_0,
write_csr(dd, DC_DC8051_CFG_EXT_DEV_0, 0);
reg = read_csr(dd, DC_DC8051_CFG_EXT_DEV_0);
write_csr(dd, DC_DC8051_CFG_EXT_DEV_0, reg);