Nand Boot on IMX6UL

[jasonshao]

Hi,

      I used uboot-imx-imx_v2016.03_4.1.15_2.0.0_ga source code on my IMX6UL board, but it failed when read data from nand flash(MT29F2G08ABAEA),below is the information:

      => nand read ${loadaddr} 0x4000000 0x800000

      NAND read: device 0 offset 0x4000000, size 0x800000
      NAND read from offset 4000000 failed -74
      0 bytes read: ERROR
      Command failed, result=1

[igorpadykov]

Hi Jason

one can check if defined  CONFIG_SYS_USE_NAND in uboot/include/configs/mx6ul_14x14_evk.h

Review sect.2.8 NAND flash i.MX6UL EVK Guide

https://www.nxp.com/docs/en/user-guide/IMX6ULEVKHUG.pdf 

Program NAND with MFG Tools from link

i.MX 6 / i.MX 7 Series Software and Development Tool|NXP 

Best regards
igor
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[jasonshao]

Hi igor,

      I have double checked the configs, it is well. And the MFG tools are also right. But I can not read data out from Nand Flash. Please help...

[igorpadykov]

what is real issue here as you mentioned two different problems:

"nand boot"  and  "uboot failed ..when read data from nand flash" ,

had you checked nand signals with oscilloscope ?

For nand boot debug one can follow description on

i.MX6Q NAND boot issues 

Best regards
igor

[jasonshao]

Hi igor,

They are the same thing. When boot from nand,it need read env settings and kernel from Nand flash,all failed. When I do a 'nand read' comman in main_loop console manually, it failed too. The EEROR information are all like this:     

      "NAND read from offset xx failed -74"      

Below is detials:

[igorpadykov]

so what happens when processors boots from nand, does it reach uboot prompt.

If not one can attach jtag and check boot configuration in SRC_SBMR1,2

registers and check boot data at 0x907400 as described on

https://community.nxp.com/thread/307723 

~igor

[jasonshao]

yes, it reach uboot prompt.But can not read data out from the Nand, the error information as described above.

[igorpadykov]

please post this on uboot mail list

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