USB 3.0在处理和外部设备供电的方式上有几个优点。
USB 3.0 includes several advances in the way it handles power to external devices.
QEMU 是一个平台虚拟化应用程序，让您能够仿真完整的计算机（处理器和相关的外部设备），用于在其上虚拟化另一种操作系统。
QEMU is a platform virtualization application that allows you to emulate an entire computer (processors and associated peripherals) for purposes of virtualizing another operating system on it.
在处理代码时，请注意程序如何从 xgpio_l.h 导入 GPIO 的基地址 —— 如果变动了外部设备的基地址，EDK 会自动更新它。
While you're in there, note in passing how the program imports the GPIO base address from xgpio_l.h -- this is dynamically updated by EDK if you shuffle around the base address of the peripheral.
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