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Forum Post: RE: Register operation failure when booting u-boot.img from NAND Flash (MMC1)

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[quote user="Jun Sheng"]You mean when we set the SYSBOOT pins, ROM code not only determines the searching sequence for MLO, but also initializes corresponding devices, like MMC0, SPI0, UART0 and then USB0?[/quote]
 
Yes, this is correct. You will need to implement MMC1 initialization and initial negotiation with the eMMC in the SPL.

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