Tool/software:
hello！
2：Bit9=1，Bit9/8/7=101，Primary startup mode is SD card， Set the device to this mode.，Once the SD card is inserted, the device will boot and operate normally.
However, when the primary boot mode is set to EMMC and the secondary boot mode is set to SD card（（Bit13/12/11/10=1101））, and the EMMC is empty, the device should theoretically switch to the secondary boot mode. However, it fails to start normally. What could be the reason?
