内核启动后停在如下打印:
Freeing unused kernel memory: 320K (c064e000 - c069e000)
使用gdb调试,查看cpu处于idle状态,如下:
#0 cpu_v7_do_idle () at arch/arm/mm/proc-v7.S:74
#1 0xc00107e8 in arch_cpu_idle () at arch/arm/kernel/process.c:72
#2 0xc005c740 in cpuidle_idle_call () at kernel/sched/idle.c:156
#3 cpu_idle_loop () at kernel/sched/idle.c:251
#4 cpu_startup_entry (state=<optimized out>) at kernel/sched/idle.c:299
#5 0xc04cff94 in rest_init () at init/main.c:412
#6 0xc064e86c in start_kernel () at init/main.c:685
#7 0x0000807c in ?? ()