I download image to my custom board similar to the I.MX6Q Sabresd using mfgtool. One board can boot successfully. Another board failed to execute the uboot, but I sure all the image had be downloaded by mfgtool. However, it always detect the HID-compliant device in mfgtool after reset my board. I download my uboot.bin to ddr, and enter the uboot command line. I change the uboot command line parameters to make it boot from emmc, and it can enter rootfs successfully. By the way, Boot Select Table is the same as another board. I can detect the pulse of SD4_CMD from the oscilloscope.
Have I missed anything?