uboot命令

• sf

sf是操作spi接口 的flash的

sf probe [[bus:]cs] [hz] [mode]        - init flash device on given SPI bus and chip select

sf read addr offset len                     - read `len' bytes starting at`offset' to memory at `addr'

sf write addr offset len                     - write `len' bytes from memor at `addr' to flash at `offset'

sf erase offset [+]len                        - erase `len' bytes from `offset' `+len' round up `len' to block size

• bootm 引导内存中的系统镜像

bootm addr

烧写内核时要注意，内核要和uboot的分区对应起来起始地址和长度不能错，否则会报错。