DM3730uboot启动过程中没有加载SPI驱动，也就是说在uboot阶段时无法使用SPI功能。本源码根据TI别的平台的uboot启动代码修改而来，已经经过验证，适合DM3730 SPI。使用时需要注意配合自己的SPI器件修改DM3730 SPI相应寄存器值，比如是上升沿还是下降沿，有没有DC/X等等。-DM3730uboot not loaded during startup SPI driver, that can not be used in stage uboot SPI function. The source platform based on TI other modified from uboot boot code has been validated for DM3730 SPI. When used with the need to pay attention to their own modifications DM3730 SPI SPI devices corresponding register values, such as is rising or falling, there is no DC/X and more.