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→MMC design rules
*MMC0 can not be used by SODIMM connector and on board uSD card reader at the same time.
*MMC1 is not bootable during system boot process using the bootmode pad.
*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 PU resistors tied to 3V3 must be necessary in lines:SD1_Dx, SD1_CD and SD1_CLK.
*Optional: low resistance resistors could be necessary to equalize bus impedances. Use 10R series resistors could be necessary in lines: SD1_Dx, SD1_CD and SD1_CLK .
== UART ==
