we're trying to boot a custom board with an imx7 and eMMC connected to USDHC3.
The board boots in manufacturing mode, and we're able to write the eMMC from linux loaded by the manufacturing tool.
We've checked the image written to mmcblk2boot0 is correct by reading it with the dd command.
When we reboot the board it's stays in manufacturing mode.
We see the boot ROM sending commands to the eMMC with the 347.22 KHz clock, but never switching to the 20MHz clock.
Is there a way to read boot ROM errors from an imx7? For the imx6 it's been mentioned there's a boot ROM log buffer.