如果在运行状态，用reset信号复位2410，那么CP15会改变状态吗？如果已启用MMU,大端模式，复位后CP15能回到小端，关闭MMU吗？
外设寄存器很多都有确定的复位值，但是cp15是协处理器，它有复位吗？
2410手册这么写的复位动作，不过没有提到协处理器阿？
When nRESET goes HIGH again, ARM920T:
1. Overwrites R14_svc and SPSR_svc by copying the current values of the PC and CPSR into them. The value of
the saved PC and SPSR is not defined.
2. Forces M[4:0] to 10011 (Supervisor mode), sets the I and F bits in the CPSR, and clears the CPSR's T bit.
3. Forces the PC to fetch the next instruction from address 0x00.
4. Execution resumes in ARM state.
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