dm368 mmc1接口不能正常工作

ti的专家你们好，我们在用dm368 ipnc5.0的方案，现在把mmc1的接口连接出来使用，但是插上SD卡后不能正常使用，修改的地方为board-dm368-ipnc.c文件添加

dm365evm_mmc_configure();       /
 davinci_setup_mmc(1, &dm365evm_mmc1_config);   

内核启动时能正常检测到两张SD卡，

[    5.509576] davinci_mmc davinci_mmc.0: Using DMA, 4-bit mode
[    5.518193] davinci_mmc davinci_mmc.1: Using DMA, 4-bit mode
[    5.646257] Loading iSCSI transport class v2.0-870.
[    5.724240] mmc0: new high speed SDHC card at address 59b4
[    5.741054] mmcblk0: mmc0:59b4 00000 7.47 GiB
[    5.748626]  mmcblk0: p1
[    5.979491] iscsi: registered transport (tcp)
[    5.984367] mmc1: new high speed SDHC card at address b368
[    6.001256] mmcblk1: mmc1:b368 MSD   3.84 GiB
[    6.012694]  mmcblk1: p1

但是当想MMC1的sd卡写数据的时后可以写进一部分数据，然后会报错：

[   97.200689] end_request: I/O error, dev mmcblk1, sector 31856
[   97.212933] mmcblk1: error -84 transferring data, sector 31864, nr 256, card status 0x900
[   97.236211] mmcblk1: error -84 sending stop command, response 0x6000006, card status 0x900
[   97.262334] end_request: I/O error, dev mmcblk1, sector 31864

最后导致SD卡变为只读文件系统，开始我以为是SD卡的频率太高（我们是飞的线)导致不正常，然后再board-dm368-ipnc.c文件中降低了时钟最高频率，但是情况还是一样，请问这该怎么解决啊？不甚感激！