i.MX ProcessorsのトピックRe: Cannot boot IMX7D board by nand flash

Cannot boot IMX7D board by nand flash

kevinmu — Thu, 23 Mar 2017 21:26:52 GMT

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 6.6.2.5 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 ?

Thanks.

Re: Cannot boot IMX7D board by nand flash

igorpadykov — Fri, 24 Mar 2017 00:07:38 GMT

Hi Kevin

please try to write to nand using mfg tools from

http://www.nxp.com/products/software-and-tools/software-development-tools/i.mx-software-and-tools/i.mx-6series-i.mx-7series-software-and-development-tool-resources:IMX_SW

To enter serial downloader mode, please remove sd card (boot settings from sd),

processor will enter that mode after some timeout. Check sect.6.6 System Boot i.MX7D Reference Manual

http://cache.nxp.com/files/32bit/doc/ref_manual/IMX7DRM.pdf

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Cannot boot IMX7D board by nand flash

gopinathsriniva — Thu, 22 Jun 2017 09:47:17 GMT

Hi Kevin,

Can I ask you, how you enabled the NAND driver support in u-boot in IMX7? I enabled it by setting CONFIG_NAND_MXS=y in def_config file. But I cannot find any NAND device under command.

=> nand device
no devices available

Thanks,

Gopinath