1 /*
  2 tiny6410用的nandflash为 一页2K
  3 */
  4 
  5 
  6 #define NFCONF             (*((volatile unsigned long*)0x70200000))
  7 #define NFCONT             (*((volatile unsigned long*)0x70200004))
  8 #define NFCMMD             (*((volatile unsigned char*)0x70200008))
  9 #define NFSTAT             (*((volatile unsigned char*)0x70200028))
 10 #define NFADDR             (*((volatile unsigned char*)0x7020000c))
 11 #define NFDATA             (*((volatile unsigned char*)0x70200010))
 12 
 13 void select_ship(void)
 14 {
 15     NFCONT &= ~(1<<1);    
 16 }
 17 
 18 void delselect_ship(void)
 19 {
 20     NFCONT |= (1<<1);
 21 }
 22 
 23 void clean_RnB()
 24 {
 25     NFSTAT |= (1<<4);
 26 } 
 27 void nand_cmd(unsigned char cmd)
 28 {
 29     NFCMMD = cmd;   
 30 }
 31 
 32 void wait_RnB(void)
 33 {
 34     while(!(NFSTAT & 0x1));
 35 }
 36 
 37 void nand_addr(unsigned char addr)
 38 {
 39     NFADDR = addr;
 40 }
 41 
 42 void nand_reset(void)
 43 {
 44     /* 选中 */
 45     select_ship();
 46     
 47     /* 清除RnB */
 48     clean_RnB();
 49     
 50     /* 发出复位信号 */
 51     nand_cmd(0xff);
 52     
 53     /* 等待就绪 */
 54     wait_RnB();
 55     
 56     /* 取消选中 */
 57     delselect_ship();
 58 }
 59 
 60 void nand_init(void)
 61 { 
 62 
 63     
 64     /* 设置时间参数 */
 65 #define TACLS  7
 66 #define TWRPH0 7
 67 #define TWRPH1 7
 68     
 69     NFCONF &= ~((7<<12)|(7<<8)|(7<<4));
 70     NFCONF |= (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4);
 71     
 72     /* 使能 nandflash controller*/
 73     NFCONT = 1 | (1<<1);
 74     
 75     
 76     
 77     /* 复位 */
 78     nand_reset();
 79 }
 80 
 81 void NF_PageRead(unsigned long addr,unsigned char* buff)
 82 {
 83     int i;
 84     
 85     
 86     /* 选中芯片 */
 87     select_ship();
 88     
 89     /* 清除RnB */
 90     clean_RnB();
 91     
 92     /* 发出命令0x00 */
 93      nand_cmd(0x00);
 94         
 95      /* 发出列地址 */
 96     nand_addr(0x00);
 97     nand_addr(0x00);
 98 
 99     /* 发出行地址 */
100     nand_addr(addr&0xff);
101     nand_addr((addr >>8 ) & (0xff));
102     nand_addr((addr >>16 ) & (0xff));
103         
104     /* 发出命令0x30 */
105      nand_cmd(0x30);
106         
107     /* 等待就绪 */
108      wait_RnB();
109         
110     /* 读数据 */
111      for(i = 0; i<1024*2; i++)
112     {
113         *buff++ = NFDATA;
114     }
115         
116       
117      /* 取消片选 */
118      
119      delselect_ship();
120      
121 }
122 
123 
124 int NF_Erase(unsigned long addr)
125 {
126     int ret;
127     
128     //选中flash芯片
129     select_ship();
130     
131     //清除RnB
132     clean_RnB();
133     
134     //发送命令60
135     nand_cmd(0x60);
136     
137     //发送行地址（3个周期）
138     nand_addr(addr&0xff);
139         nand_addr((addr >>8 ) & (0xff));
140         nand_addr((addr >>16 ) & (0xff));
141     
142     //发送命令D0
143     nand_cmd(0xD0);
144     
145     //等待RnB
146     wait_RnB();
147     
148     //发送命令70
149     nand_cmd(0x70);
150     
151     //读取擦除结果
152     ret = NFDATA;
153     
154     //取消选中flash芯片
155     delselect_ship();
156     
157     return ret;
158 }
159 
160 int NF_WritePage(unsigned long addr,unsigned char* buff)
161 {
162     int ret,i;
163     
164     //选中flash芯片
165     select_ship();
166     
167     //清除RnB
168     clean_RnB();
169     
170     //发送命令80
171     nand_cmd(0x80);
172     
173     //发送列地址（2个周期）
174     nand_addr(0x00);
175         nand_addr(0x00);
176     
177     //发送行地址（3个周期）
178     nand_addr(addr&0xff);
179         nand_addr((addr >>8 ) & (0xff));
180         nand_addr((addr >>16 ) & (0xff));
181     
182     //写入数据
183     for(i=0;i<1024*2;i++)
184     {
185         NFDATA = buff[i];    
186     }
187     
188     //发送命令10
189     nand_cmd(0x10);
190     
191     //等待RnB
192     wait_RnB();
193     
194     //发送命令70
195     nand_cmd(0x70);
196     
197     //读取写入结果
198     ret = NFDATA;
199     
200     //取消选中flash芯片
201     delselect_ship();
202     
203     return ret;
204 }

 1 copy_to_ram:
 2     mov r0,#0
 3     ldr r1,=_start
 4     ldr r2,=bss_end
 5     
 6     sub r2,r2,r1
 7     mov ip,lr
 8     bl nand_to_ram
 9     
10     mov lr,ip
11     
12     
13     mov pc,lr

 1 void nand_to_ram(unsigned long start_addr,unsigned char* sdram_addr,int size)
 2 {
 3         int i;
 4                
 5     for( i=(start_addr >>11); size>0;)
 6     {
 7         NF_PageRead(i,sdram_addr);    
 8         size -= 2048;
 9         sdram_addr += 2048;
10         i++;
11     }
12         
13 }