I usd MCIMX6Q6AVT10AD in my design.
It only have 1GB,DDR,and 8G MMC.
EIM 、SDs、NAND_flash,and so on Port are float
The uboot I used from mx6q_sabresd .
NOW,I change BOOT_MODE pin to Serial download mode. My board can download uboot and kenerl .then I change BOOT_MODE to eFuse It shows Serial download and I can download uboot and kenerl.
But I change BOOT_MODE to in Start internal，open and close the power supply，sometime It can start ,sometime It jump to Serial download ,and I can download uboot and kenerl.
what`s wrong ? what can I do ?
Please help me and thank you!