root@intel-x86-64:~# devmem 0xfed10000 128 Memory mapped at address 0x7f5e5e1d5000. The system hang And it also hangs after execute "devmem 0xfed10000 64". root@intel-x86-64:~# devmem 0xfed10000 64 0x0000000001C03AFE The system hang