Part Number:TDA4VM
您好!
在BOOT MODE PIN脚设置中,MMC/SDCARD的配置中,第4个BOOT MODE PIN的0、1分别对应:Filesystem mode 和Raw Mode
这个Filesystem mode 和Raw Mode是和SD卡的什么特性相关?一般情况需要把这个BOOT MODE PIN设为0还是1?
感谢您的指导和支持!
资料中此部分的描述如下图:
Shine:
Raw mode是原始格式,从User Data Area (UDA) 里读取image data。Filesystem mode使用了文件系统,是从文件系统里读取image data。
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XIANSH BI:
请问,如果是一样的image data,原始格式和使用了文件系统有什么区别吗?
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Shine:
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.
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XIANSH BI:
谢谢指导!
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Shine:
不客气~