u-boot environment switching error

[vinothkumars]

Dear NXP,

By default u-boot environment stored in EMMC offset - 0x400000.

I implement the new EMMC partition and switch u-boot environment variable to that partition,

include/configs/imx8mn_evk.h

        #define CONFIG_SYS_MMC_ENV_PART 12 

Created the partition,

         +#part 12
+part /env --source bootimg-partition --ondisk mmcblk --fstype=vfat --label env --align 8192 --size 64

But, while booting I got following error - 

Loading Environment from MMC... VINOTH ++++++++++++++++++++++++++++ mmc_set_env_part env partition is 12
VINOTH ++++++++++= blk_select_hwpart_devnum ++++++++++++++++ hwpart: 12 +++ ret: 0
VINOTH ++++++++++= mmc_switch_part ++++++++++++++++ part_num: 12 +++
VINOTH ++++++++++= mmc_select_hwpart 3 ++++++++++++++++ hwpart: 12 +++ ret: -5
MMC partition switch failed

[jimmychan]

This may help you. You may find some hints from the discussion of below link.

https://lists.denx.de/pipermail/u-boot/2013-June/155723.html

For the new version of u-boot, the mmc.c is in the env folder.

https://source.codeaurora.org/external/imx/uboot-imx/tree/env/mmc.c?h=imx_v2019.04_5.4.3_2.0.0