拨码开关

模式	1	2	3	4	5	6	7	8	1	2	3	4
eMMC启动	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF	ON	OFF
TF 卡烧写	OFF	ON	OFF	OFF	OFF	ON	ON	ON	ON	OFF	ON	OFF
QSPI启动	ON	OFF	ON	OFF	ON	OFF	OFF	OFF	ON	ON	ON	OFF
OTG 烧写	X	X	X	X	X	X	X	X	X	X	OFF	ON
X代表任意模式