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Raspberry Pi CM4 – Three more graphics cards
- monocasa 6y agoHey, sorry for the late comment, just saw your youtube video. Have you heard anything about the IO port BARs? There's typically a special knock needed on the root complex explaining "I wish to map IO ports to this 64KB MMIO range here instead" needed on MMIO only archs like ARM. GPUs are the least likely to be able to handle a lack of IO port BARs. I've seen that kind of thing personally in MIPS router SoCs. If you have a back channel to the RPi foundation where we can either ask specific questions for the PCIe root complex IP block that they have an NDA on or get in on their NDA we might be able to make progress on this. It's just really difficult (next to impossible in fact) without their NDAed docs.