I have downloaded u-boot-1.1.1 amd u-boot-1.1.1-imx1.diff,and I have cross-compile them successfully.luckly,the bootloader can init the serial port.then ,I want to enable the CS8900,but failed. I used to boot mx1ads by BLOB,and blob can get the ID of cs8900 correctly,so I cpoy these codes in blob to U-boot,but these codes are useless to get the ID of CS8900.The codes are as follows: unsigned short c;
//set chip select 4 upper control register *(volatile P_U32)(0x00220020) = 0x00000F00; //set chip select 4 lower control register *(volatile P_U32)(0x00220024) = 0x80001501; //p the GPIO muxing to use Chip Select 4 *(volatile unsigned int *)(0x0021C020) &= 0xFF3FFFFF; *(volatile unsigned int *)(0x0021C038) &= 0xFF3FFFFF; //QiYao change the GPIO pin to PortC pin 17 *((volatile unsigned int * ) 0x0021c220)&=~0x00020000; *((volatile unsigned int *) 0x0021c238)&=~0x00020000;
c = *(volatile unsigned short *)(0x15000300);//The Base address of CS8900
CS8900_PPTR = regno; printf("CS8900_PDATA = %x\n",CS8900_PDATA);
I have check the codes for some times ,and i dnot know where the mistake is,so i ask you to help me.
Qiyao , Beijing Institute of Technology