u-boot-2010.03在tq6410上的移植详解(五)

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七．Uboot支持yaffs2文件的读写

       由于Uboot本身支持yaffs2文件的读写直接修改./include/configs/smdk6410.h的配置文件，使得uboot支持yaffs2的读写，重新编译Uboot并下载到Nand Flash中，串口打印信息如下，uboot已经支持yaffs2烧写到nand flash（由于本人对于此uboot中指令不熟悉，所以至今还未写yaffs2文件成功，如有知道的可告知，谢谢）。

于是又重新手动yaffs2文件的烧写指令。首先修改./include/configs/smdk6410.h

#cd include/configs/smdk6410.h//

#define CONFIG_YAFFS2

于是又重新手动yaffs2文件的烧写指令。

1)       修改./include/configs/smdk6410.h

注意一定要屏蔽掉CONFIG_YAFFS2，否则yaffs文件读写有冲突。

#cd include/configs/smdk6410.h//

//#define CONFIG_YAFFS2

#define CONFIG_SYS_NAND_YAFFS_WRITE     1 /* support yaffs write    EN       */

#define CONFIG_MTD_NAND_ECC_YAFFS 1

2)修改common/cmd_nand.c

在373行，红色字体为添加部分

if (!s || !strcmp(s, ".jffs2") ||

                 !strcmp(s, ".e") || !strcmp(s, ".i")) {

                    if (read)

                           ret = nand_read_skip_bad(nand, off, &size,

                                                (u_char *)addr);

                    else

                           ret = nand_write_skip_bad(nand, off, &size,

                                                (u_char *)addr);

             }

              #if defined(ENABLE_CMD_NAND_YAFFS)

              }else if ( s != NULL &&

                     (!strcmp(s, ".yaffs") || !strcmp(s, ".yaffs1"))){

                         if(read) {

                            printf("nand read.yaffs[1] is not provide temporarily!");

                         } else    {

                            nand->rw_oob = 1;

#if defined(ENABLE_CMD_NAND_YAFFS_SKIPFB)

                            nand->skipfirstblk = 1;

#else

                            nand->skipfirstblk = 0;

#endif

                            ret = nand_write_skip_bad(nand,off,&size,(u_char *)addr);

#if defined(ENABLE_CMD_NAND_YAFFS_SKIPFB)

                            nand->skipfirstblk = 0;

#endif

                            nand->rw_oob = 0;

                         }

#endif

}           

             else if (!strcmp(s, ".oob")) {

                    /* out-of-band data */

                    mtd_oob_ops_t ops = {

                           .oobbuf = (u8 *)addr,

                           .ooblen = size,

                           .mode = MTD_OOB_RAW

                    };

在505行添加，红色字体为添加部分

"nand erase [clean] [off size] - erase 'size' bytes from\n"

      "    offset 'off' (entire device if not specified)\n"

      #if defined(CONFIG_SYS_NAND_YAFFS_WRITE)

      "nand read[.yaffs[1]] is not provide temporarily\n"

      "nand write[.yaffs[1]] addr off size -write the 'size' byte yaffs image starting\n"

      "at offset 'off' from memory address 'addr' (.yaffs for 512+16 Nand)"

      #endif

      "nand bad - show bad blocks\n"