如何检测冷启动与热启动在ARM处理器上？ [英] How to detect cold boot versus warm boot on an ARM processor?

问题描述

我正在寻找一种方法来确定一个ARM处理器是否从冷启动启动（即初始上电）与热启动（即重置没有实际的功率损耗断言）。特别是我使用的是ARM968内核，将使得使用C或组装的决心，我会用这样的决心某些操作只能在随后的复位初始上电和无法运行。在previous项目，我已经利用外部电路（如FPGA）来检测不同的引导方案，但在这种情况下，我仅限于ARM内核。

I'm looking for a way to determine whether an ARM processor is booting from a cold boot (i.e. initial power-on) versus a warm boot (i.e. reset assertion without actual power loss). Specifically I'm using an ARM968 core, will be making the determination using C or assembly, and I will use the determination so certain operations only run on the initial power-on and not on subsequent resets. In previous projects I've leveraged external circuitry (e.g. FPGA) to detect the different boot scenarios, but in this case I am limited to the ARM core.

推荐答案

您可以在内存中的全局变量初始化到冷启动过程中是不可能的值，并且在引导过程中检查这一点。

You can initialize a global variable in RAM to a value that is unlikely during cold boot, and check for that during boot.

有关微控制器通常是特定芯片的复位逻辑提供了一个状态寄存器，它指示复位源。我不知道这是否存在此更大的核心，您是否可以使用。

For microcontrollers normally the reset logic of the specific chip provides a status register, which indicates the source of the reset. I don't know if that exists for this bigger core, and whether you could use that.

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