Lu, Yinghai wrote: > Are you sure? > > You just changed failover.c and if USE_DCACHE_RAM=1, only > cache_as_ram_auto.c is used. oops. I am still getting the hang of all this. Sorry. I still don't see how your serial setup ever worked ... you were enabling the runtime registers but then changing settings in the SP1 registers. Back to school for me! ron