AU1000_SYS_CPUPLL
t = alchemy_rdsys(AU1000_SYS_CPUPLL) & 0x7f;
sleep_sys_clocks[3] = alchemy_rdsys(AU1000_SYS_CPUPLL);
alchemy_wrsys(sleep_sys_clocks[3], AU1000_SYS_CPUPLL);