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=== MMC design notes ===
*Optional MMC MMC1 is not bootable during system boot process. *MMC MMC1 bus is a good option to expand memory capacities or use as a backup memory.*MMC bus needs PU resistors to avoid unknown signals. 10K resistors from 3V3 source to SD1_Dx, SD1_CD and SD1_CLK must be necessary.*Optionally: low resistance resistors could be necessary to equalize bus impedances. 10R series resistors to SD1_Dx, SD1_CD and SD1_CLK could be necessary.
== UART ==