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From the "how the fuck did this hardware bug happen" department: Sandy Bridge GPUs cannot access the low 1MB of RAM, plus five pages. The pages at 0x20050000, 0x20110000, 0x20130000, 0x20138000, 0x40004000. Specifically.pic.twitter.com/rMN20Lt3xX
Also this only works for main RAM, if you have a PCIe device IO range mapped somewhere in there that the GPU has to hit (e.g. an nvidia card exposing a framebuffer for sharing or something), expect things to explode and there is no fix.
Also nobody seems to know how this interacts with the IOMMU ¯\_(ツ)_/¯
easy answer: the intel integrated gpu can't do any transactions to any other pci or pcie devices directly. only main memory. it pretends to be a pcie device to make windows happy. It really isn't.
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