I've had good experiences with Magma PCIe expanders, for linux and macis, though they are firmly in the enterprise space. https://www.onestopsystems.com/pcie-ex

I've had good experiences with Magma PCIe expanders, for linux and macis, though they are firmly in the enterprise space. https://www.onestopsystems.com/pcie-expansion https://www.onestopsystems.com/pcie-expansion Ah, the joys of finding quirks in PCIe enumeration when you have PCIe switches and expansion bridges.