I’ve been using the Grove Sensor Mezzanine board with two different platforms: Ultra96 V1 and IMX7-96, both running Linux. On both the mezzanine works (to the limited extent that I have tested so far i.e. flashing an LED) but on both the UART connection doesn’t work. On the Ultra96 I get output (from U-boot and Linux) but I can’t input anything. And on the IMX7-96 I get nothing at all. Obviously the on-board UART connections work in both cases without the mezzanine (via the JTAG-Serial dongle in the case of the Ultra96 and a normal Prolific USB-UART adapter for the IMX7-96).
Has anyone tried this combination of hardware before? I’m wondering if I need to change something in the devicetree so that the UART is connected (and in U-Boot I guess).
Any ideas or experience greatly appreciated!