【记录】在TQ2440的uboot中添加SD/MMC支持 + 添加USB Mass Storage支持

npuazm

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npuazm

查看 SD 协议，里面有这样的说明
CSD_STRUCTURE
里面有如下的描述
CSD Version 1.0（Version 1.01-1.10 Version 2.00/Standard Capacity）
CSD Version 2.0（Version 2.00/High Capacity）

如果是 High Capacity 卡的话，就按照sd 协议的描述的去计算
“C_SIZE
This field is expanded to 22 bits and can indicate up to 2 TBytes (It is the same as the maximum
memory space specified by a 32-bit block address.)
This parameter is used to calculate the user data area capacity in the SD memory card (not include the
protected area). The user data area capacity is calculated from C_SIZE as follows:
memory capacity = (C_SIZE+1) * 512K byte”

红色字体是协议中的内容，希望我的描述对你有帮战