[U-Boot-Users] I can not drive the cs8900 on mx1ads by u-boot-1.1.1-imx1

[齐尧]

hi,
    I am sorry to send unreadable mail so many times.I want to try again.
    Now ,the u-boot can work well ,but the i can not controlethcad cs8900 very well.i can not read the id of cs8900.I have ported the blob to mx1ads ,and i can get the id of cs8900 .now ,i just copy the code in blob to u-boot to get the id of cs8900 ,but i am failed .I do not know why .
    the code related to is as follows :
    //set CS4U 
    *(volatile unsigned long*)(0x00220020)  = 0x00000F00;
    //set CS4L control register
    *(volatile unsigned long*)(0x00220024)  = 0x80001501;
    //set  the GPIO muxing to use Chip Select 4
    *(volatile unsigned long*)(0x0021C020) &= 0xFF3FFFFF;
    *(volatile unsigned long*)(0x0021C038) &= 0xFF3FFFFF;
    //the irq is connect to  GPIO pin to PortC pin 17
    *((volatile unsigned long* ) 0x0021c220)&=~0x00020000;
    *((volatile unsigned long*)  0x0021c238)&=~0x00020000;
    //send the base address of cs8900 on the ADD Bus 
     c = *(volatile unsigned char *)(0x15000300);
     CS8900_PPTR = regno;
     printf("CS8900_PDATA = %x\n",CS8900_PDATA);

the result is always 0x5555,i do not know why,these codes above can work well in blob.
 I am looking forward your reply,thank ahead!
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