[U-Boot-Users] I can not drive cs8900 on mx1ads by u-boot.
齐尧
qiyao at bit.edu.cn
Tue Sep 21 12:15:55 CEST 2004
Hi,everyone:
i am sorry to have sent mails unreadable.Now,i changed the format of letter and try again.
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
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