I just realised that the pin muxing on the MIMXRT106x parts means that you cannot have LCD + SDRAM + 2 x Ethernet.
This is because signal ENET2_MDC is only available on pins D6 and D7
Pin D6 is also the only pin that can be used for SEMC_DM1
Pin D7 is also the only pin that can be used for LCDIF_CLK
This is a shame!
One of the attractive things about this device is the great LCD interface and the 2 x Ethernet.
And you need the SDRAM for frame buffers.