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Cannot boot IMX7D board by nand flash

Question asked by Kevin Mu on Mar 23, 2017
Latest reply on Jun 22, 2017 by Gopinath Srinivasan

I have customized  IMX7D board and can boot it by SD successfully.


Then I mount nand device, and enable nand driver in uboot and linux, and can operate everything on nand device in both uboot linux.


then I prepare the u-boot-nand.imx with mx7dsabresd_nand_defconfig, and program it on to mtd0 on nand using  

$ flash_erase /dev/mtd0 0 0 $ kobs-ng init -x u-boot.imx-nand --search_exponent=1 -v

Then I reset board, I get nothing in uboot console with MODE_MODE[1:0] setting 00b. 


After reading manual, I realize I can not boot device from nand flash using Fuses Mode, because device is never programmed by mfgtools, so eFUSE value is null.  Then I  set MODE_MODE[1:0]  to be 10b, i.e internal boot mode. according to the on manual, I can  use gpio boot overrides based on table 6-26. 


But my questions is how can I set these pins to make them being used in boot process.


Anybody has the similar issue ?