怎么知道evb板上连接的是spi nor还是spi nand flash？

方法1：子板丝印不一样，丝印会有nor或nand标识。

方法2：linux启动log会有打印，比如连接spi nor时会有类似下面打印

[root@canaan ~ ]#dmesg | grep spi
[    1.299989] spi spi0.0: setup mode 0, 8 bits/w, 100000000 Hz max --> 0
[    1.306704] spi-nor spi0.0: gd25lx256e (32768 Kbytes)
[    1.311786] 2 fixed-partitions partitions found on MTD device spi0.0
[    1.318147] Creating 2 MTD partitions on "spi0.0":