tf卡插上无法读取

张大帅

各位大佬帮忙看下：
       开发板插上tf卡后，dev/没有接口文件生成，下面是报错日志，好像和读写速率有关。。





You
[ 1761.075647] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)[ 1761.110799] mmc_host mmc1: Bus speed (slot 0) = 300000Hz (slot req 300000Hz, actual 300000HZ div = 0)[ 1761.148312] mmc_host mmc1: Bus speed (slot 0) = 200000Hz (slot req 200000Hz, actual 200000HZ div = 0)[ 1761.186512] dwmmc_rockchip fe2c0000.mmc: failed to set rate 100000Hz[ 1761.186590] mmc_host mmc1: Bus speed (slot 0) = 200000Hz (slot req 100000Hz, actual 100000HZ div = 1)[ 1761.199286] dwmmc_rockchip fe2c0000.mmc: failed to set rate 100000Hz[ 1761.203464] dwmmc_rockchip fe2c0000.mmc: failed to set rate 100000Hz