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您好，我计划采用评估板上的NAND flash直接启动，不知道其启动速度与评估板上的SPI flash直接启动理论上哪个更快？多谢！
nand flash的速度比SPI的速度要快。因为SPI boot模式下，ROM bootloader会bypass掉PLL，DSP跑的速度是输入时钟的速度。NAND boot模式下ROM bootloader会初始化PLL。
请看下面的bootloader文档说明3.8.1 RBL Initialization Process。The RBL also bypasses the PLL and runs the CorePacs at the reference clock frequency.https://www.ti.com/lit/ug/sprugy5c/sprugy5c.pdf
