移植nand支持到uboot， 使用nand_legacy.c

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網(wǎng)上大部分是利用drivers/nand/nand.c或者common/env_nand.c的，但是還有個drivers/nand_legacy/nand_legacy.c，我還不清楚為什么會有2個目錄，據(jù)說新的uboot是靠nand_legacy.c實現(xiàn)的，于是我想移植到nand_legacy.c下。

 

1、先make smdk2410_config，make成功后再拷貝如下代碼到nand_legacy.c的適當(dāng)位置：

1. /*-----------------------------------------------------------------------
   
2. 
   
3. * NAND flash basic functions
   
4. 
   
5. * Added by liuyaojin 2009.5.20
   
6. 
   
7. * Copied from board/mpl/vcma9/vcma9.h & vcma9.c
   
8. 
   
9. */
   
10. #if (CONFIG_SMDK2410)
    
11. #include <s3c2410.h>
    
12. 
    
13. 
    
14. typedef enum {
    
15. 
    
16. NFCE_LOW,
    
17. 
    
18. NFCE_HIGH
    
19. 
    
20. } NFCE_STATE;
    
21. static inline void NF_Conf(u16 conf)
    
22. 
    
23. {
    
24. 
    
25. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
26. nand->NFCONF = conf;
    
27. 
    
28. }
    
29. static inline void NF_Cmd(u8 cmd)
    
30. 
    
31. {
    
32. 
    
33. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
34. nand->NFCMD = cmd;
    
35. 
    
36. }
    
37. static inline void NF_CmdW(u8 cmd)
    
38. 
    
39. {
    
40. 
    
41. NF_Cmd(cmd);
    
42. 
    
43. udelay(1);
    
44. 
    
45. }
    
46. static inline void NF_Addr(u8 addr)
    
47. 
    
48. {
    
49. 
    
50. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
51. nand->NFADDR = addr;
    
52. 
    
53. }
    
54. static inline void NF_SetCE(NFCE_STATE s)
    
55. 
    
56. {
    
57. 
    
58. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
59. switch (s) {
    
60. 
    
61. case NFCE_LOW:
    
62. 
    
63. nand->NFCONF &= ~(1<<11);
    
64. 
    
65. break;
    
66. case NFCE_HIGH:
    
67. 
    
68. nand->NFCONF |= (1<<11);
    
69. 
    
70. break;
    
71. 
    
72. }
    
73. 
    
74. }
    
75. static inline void NF_WaitRB(void)
    
76. 
    
77. {
    
78. 
    
79. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
80. while (!(nand->NFSTAT & (1<<0)));
    
81. 
    
82. }
    
83. static inline void NF_Write(u8 data)
    
84. 
    
85. {
    
86. 
    
87. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
88. nand->NFDATA = data;
    
89. 
    
90. }
    
91. static inline u8 NF_Read(void)
    
92. 
    
93. {
    
94. 
    
95. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
    
96. return(nand->NFDATA);
    
97. 
    
98. }
    
99. static inline void NF_Init_ECC(void)
    
100. 
     
101. {
     
102. 
     
103. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
     
104. nand->NFCONF |= (1<<12);
     
105. 
     
106. }
     
107. static inline u32 NF_Read_ECC(void)
     
108. 
     
109. {
     
110. 
     
111. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
     
112. return(nand->NFECC);
     
113. 
     
114. }
     
115. extern ulong nand_probe(ulong physadr);
     
116. static inline void NF_Reset(void)
     
117. 
     
118. {
     
119. 
     
120. int i;
     
121. NF_SetCE(NFCE_LOW);
     
122. 
     
123. NF_Cmd(0xFF); /* reset command */
     
124. 
     
125. for(i = 0; i < 10; i++); /* tWB = 100ns. */
     
126. 
     
127. NF_WaitRB(); /* wait 200~500us; */
     
128. 
     
129. NF_SetCE(NFCE_HIGH);
     
130. 
     
131. }
     
132. static inline void NF_Init(void)
     
133. 
     
134. {
     
135. 
     
136. #if 0 /* a little bit too optimistic */
     
137. 
     
138. #define TACLS 0
     
139. 
     
140. #define TWRPH0 3
     
141. 
     
142. #define TWRPH1 0
     
143. 
     
144. #else
     
145. 
     
146. #define TACLS 0
     
147. 
     
148. #define TWRPH0 4
     
149. 
     
150. #define TWRPH1 2
     
151. 
     
152. #endif
     
153. NF_Conf((1<<15)|(0<<14)|(0<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0));
     
154. 
     
155. /*nand->NFCONF = (1<<15)|(1<<14)|(1<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0); */
     
156. 
     
157. /* 1 1 1 1, 1 xxx, r xxx, r xxx */
     
158. 
     
159. /* En 512B 4step ECCR nFCE=H tACLS tWRPH0 tWRPH1 */
     
160. NF_Reset();
     
161. 
     
162. }
     
163. void nand_init(void)
     
164. 
     
165. {
     
166. 
     
167. S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
     
168. NF_Init();
     
169. 
     
170. #ifdef DEBUG
     
171. 
     
172. printf("NAND flash probing at 0x%.8lX/n", (ulong)nand);
     
173. 
     
174. #endif
     
175. 
     
176. printf ("%4lu MB/n", nand_probe((ulong)nand) >> 20);
     
177. 
     
178. }
     
179. #endif /* (CONFIG_SMDK2410) */
     
180. 
     
181. 
     
182. 
     
183. 2、在nand_legacy.c頭上包含文件：
     
184. 
     
185. #include <configs/smdk2410.h>
     
186. 
     
187.  
     
188. 
     
189. 3、在smdk2410.h把CFG_CMD_NAND打開，適當(dāng)位置中插入如下代碼：
     
190. 
     
191.  
     
192. 
     
193. //然后把下面這些宏定義放在smdk2410.h中
     
194. /*-----------------------------------------------------------------------
     
195. 
     
196. * NAND flash settings
     
197. 
     
198. * Added by liuyaojin 2009.5.20
     
199. 
     
200. * Copied from include/conifgs/vcma9.h
     
201. 
     
202. */
     
203. #define CFG_NAND_LEGACY
     
204. //#if (CONFIG_COMMANDS & CFG_CMD_NAND)
     
205. #define CFG_MAX_NAND_DEVICE 1 /* Max number of NAND devices */
     
206. //nit i=0;
     
207. #define SECTORSIZE 512
     
208. #define ADDR_COLUMN 1
     
209. 
     
210. #define ADDR_PAGE 2
     
211. 
     
212. #define ADDR_COLUMN_PAGE 3
     
213. #define NAND_ChipID_UNKNOWN 0x00
     
214. 
     
215. #define NAND_MAX_FLOORS 1
     
216. 
     
217. #define NAND_MAX_CHIPS 1
     
218. #define NAND_WAIT_READY(nand) NF_WaitRB()
     
219. #define NAND_DISABLE_CE(nand) NF_SetCE(NFCE_HIGH)
     
220. 
     
221. #define NAND_ENABLE_CE(nand) NF_SetCE(NFCE_LOW)
     
222. 
     
223. 
     
224. #define WRITE_NAND_COMMAND(d, adr) NF_Cmd(d)
     
225. 
     
226. #define WRITE_NAND_COMMANDW(d, adr) NF_CmdW(d)
     
227. 
     
228. #define WRITE_NAND_ADDRESS(d, adr) NF_Addr(d)
     
229. 
     
230. #define WRITE_NAND(d, adr) NF_Write(d)
     
231. 
     
232. #define READ_NAND(adr) NF_Read()
     
233. 
     
234. /* the following functions are NOP's because S3C24X0 handles this in hardware */
     
235. 
     
236. #define NAND_CTL_CLRALE(nandptr)
     
237. 
     
238. #define NAND_CTL_SETALE(nandptr)
     
239. 
     
240. #define NAND_CTL_CLRCLE(nandptr)
     
241. 
     
242. #define NAND_CTL_SETCLE(nandptr)
     
243. /* #define CONFIG_MTD_NAND_VERIFY_WRITE 1 */
     
244. /* This definition above is commented by Lu Xianzi. 2006.05.28
     
245. 
     
246. Because there's no definition of a macro called __mem_pci,
     
247. 
     
248. there will be a link error.
     
249. 
     
250. */
     
251. 
     
252. #define CONFIG_MTD_NAND_ECC_JFFS2 1
     
253. //#endif /* CONFIG_COMMANDS & CFG_CMD_NAND */
     
254. //---------------添加結(jié)束-----------------------

4、make即可

需要注意的地方：

1、必須定義 #define CFG_NAND_LEGACY

2、#if (CONFIG_COMMANDS & CFG_CMD_NAND) 好像不起作用，大家小心點