We have the imx6 sabre board for smart devices with us. Please let us know the recommended mPCIe daughter boards for interfacing with the sabre board.
From the Linux Release Notes :Tested PCIe Device (GEN1 and GEN2 modes).• Intel gigabit CT network standard PCIE GEN1 X1 card.• PCIE to USB 3.0 standard PCIE GEN2 X1 card.• iwl5100/6300 WiFi mini-PCIE GEN1 X1 cards.