I'm working with an IMX6Q. How do I configure PCIe registers over the DBI? It’s referred to all over in the IMX6 reference manual but the links to “DBI Access” don’t go anywhere and I can’t seem to find any description of how it works. It seems like it's been completely left out of the reference manual. In endpoint mode we need to configure the device/vendor ID, BARs, BAR MASKs, etc but they are not writeable via direct memory access – for example on the Device/Vendor ID register it says “The application can override the default values through the DBI” . So… how do we use the DBI? Am I missing a manual or something?