i want burn image to SD card,and then there is a error, how to resolve it?
You can try to modify the u-boot/include/configs/mx6_common.h to avoid ldo bypass check, which can fit the discrete power supply.
48 #define CONFIG_LDO_BYPASS_CHECK
49 #undef CONFIG_LDO_BYPASS_CHECK
Which board are you using, is it you designed yourself?
