AMD power on

AMD的开机过程需要参考dGPU的规格来进行调试。根据AMD P1-50 Power On Sequence要求，首先需要启动Power Enable Pin(所有ASIC电源轨)。然后发出PCIE CLK信号，最后拉高Reset Pin，完成整个dGPU的开机时序。在BIOS中需要注意的是，PCIE CLK可能在Power Enable Pin启动之前就已经发出，因此可以在拉高Power Enable Pin之前先关闭PCIE Link。整个Power Sequence Code可以参考330S-IKB专案中的SwitchableGraphicsPei.c MxmDgpuPowerEnableSequence函数。而关机过程主要满足以下原则：先关闭PCIE Link，然后拉低Reset Pin，最后拉低Power Enable Pin。\[2\]
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