For imx8QM, The manufacture mode is supported on SD2 which is powered by LDO2 of PMIC2 on MEK board.
LDO2 of PMIC2 on MEK board is OFF by default. (LDO2 of PMIC1 is on by default)
So manufacture mode is NOT working on the imx8QM MEK board.
the solution would be:
1. schematic change
Exchange the power supply(VCC_LDO_SD) and USDHC_VSELECT signal of SD2 and SD1.
between PMIC2 (U23) and PMIC 1(U10).
so that, the VCC_LDO_SD2) and USDHC2_VSELECT will be located on where VCC_LDO_SD1) and USDHC1_VSELECT are origonally.
and VCC_LDO_SD1 and USDHC1_VSELECT will be located on where VCC_LDO_SD2) and USDHC2_VSELECT are origonally.
SD1 will no longer be supported as the boot resource, instead SD2 will be.
2. Modify the default fuse of PMIC, whcih is to enable LDO2 of PMIC2 by default.
please contact your local FAE and Sales for this.
we may add notification in the reference schematic and HW development guild in the future.