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Burned a number of hours with a similar problem. After attempting to initialize the SDRAM, the the Status Register (STSR) would always report 0b00000001, indicating that the SDRAM had not yet finished initialization. Almost every library I've seen (including the one that BuyDisplay provides)...

Thanks Paul! Also, regarding the MicroMod now, does the MKL02 there use the same pins as on the (first couple revisions of) Teensy 4.1? I presume it does (so the Teensy 4.1 and the MicroMod could utilize identical firmware for the MKL02, easing production of both boards), but wanted to double...

Paul, could you share details (or a schematic) regarding how the GD32E230F8 pins on the Teensy 4.1 correspond with the older revision's MKL02 pins? Wanting to set up a similar mod for debugging, and I suppose I could desolder the the chips to test the connections, but I'd like to avoid...