What limits how much of the memory a PCIe device can address?
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Some PCIe devices cannot read more than 4 GB of address space without an additional driver or modified driver. In such cases, what limits how much memory they can read? Is it the memory controller? Is it the firmware of the PCIe device? Or is it something else? I don't think it is because of the device driver itself because PCIe devices can read or write to RAM without a driver. Someone said it is a 32-bit vs 64-bit issue but I do not understand why PCIe device can only address 32-bit.