SYS/BIOS MMC on AM3359

We are converting our StarterWare program(AM335X_StarterWare_02_00_00_07\build\armv7a\cgt_ccs\am335x\evmAM335x\hs_mmcsd) to run on SYS/BIOS 6.35.3.47.The issue we are running into is that MMC write or read. When executing the following code before read MMC,and i can read the correct data from the MMC.

attrs.type = Mmu_FirstLevelDesc_SECTION; 

attrs.domain = 0;

attrs.imp = 1;

attrs.accPerm = 3;   

 for (i=0x80000000;i<0x90000000;i=i+0x00100000) {  

// Each 'SECTION' descriptor entry spans a 1MB address range        

attrs.bufferable =0;        

attrs.cacheable =0;        

Mmu_setFirstLevelDesc((Ptr)(i), (Ptr)(i) , &attrs); }

However, in this state Cache is disable,and AM3359 low operating efficiency.

When executing the following code before read MMC,and i can't read the correct data from the MMC.

attrs.type = Mmu_FirstLevelDesc_SECTION; 

attrs.domain = 0;

attrs.imp = 1;

attrs.accPerm = 3;    

for (i=0x80000000;i<0x90000000;i=i+0x00100000) {  

// Each 'SECTION' descriptor entry spans a 1MB address range        

attrs.bufferable =1;        

attrs.cacheable =1;        

 Mmu_setFirstLevelDesc((Ptr)(i), (Ptr)(i) , &attrs); }

I need help!

This is my first message here, my English is poor, please forgive me.  

Thanks!

LiZhan.