PROC_BOOT_CFG_FLAG_R5_LOCKSTEP
clr_cfg |= PROC_BOOT_CFG_FLAG_R5_LOCKSTEP;
clr_cfg &= ~PROC_BOOT_CFG_FLAG_R5_LOCKSTEP;
set_cfg = PROC_BOOT_CFG_FLAG_R5_LOCKSTEP;
lockstep_en = cfg & PROC_BOOT_CFG_FLAG_R5_LOCKSTEP ? 1 : 0;