坏块判断

myfaxmail

1. static u_size8 is_bad_block(u_size32 addr)
   
2. {
   
3.       u_size32 i;
   
4.       u_size8 tmp;
   
5.       EN_NANDFLASH;
   
6.       WCMD(READ1);
   
7.         rNFADDR = 2048 & 0xff;
   
8.         rNFADDR = (2048 >> 8) & 0xf;
   
9.         rNFADDR = (addr >> 12) & 0xff;
   
10.         rNFADDR = (addr >> 20) & 0xff;
    
11.         rNFADDR = (addr >> 28) & 0x1;
    
12.       WCMD(READ2);
    
13.       delay(10);
    
14.       noBUSY;
    
15.       tmp = rNFDATA;
    
16.         if(tmp != 0xff){
    
17.           DIS_NANDFLASH;
    
18.           return 1;
    
19.     }
    
20.       DIS_NANDFLASH;
    
21.       return 0;
    
22. }