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您可以看一下TRM文档4.2.1.1 Main Module，ROM bootloader读取的方式不一样。
RAW mode方式： Block Path This path is used by the SPI, I2C, UART, eMMC, Ethernet and MMC/SD cards in raw mode. In this mode data is received from the peripheral in blocks. Blocks are accumulated in the boot buffer until a full X.509 certificate header has been received, at which point this full certificate and any subsequent blocks are passed to the DMSC as they arrive.
文件系统方式： Filesystem Path This path is used by the MMC/SD cards in filesystem mode. This mode executes exactly like in the block path, except that the boot image location is defined by a filesystem.
