cmd编译c Bootloader之uBoot简介（转）(31)

"nand write[.jffs2] - addr off|partiton size - read/write `size' bytes starting\n"

" at offset `off' to/from memory address `addr'\n"

……

先在其中增加“nand write.yaffs ……”的使用说明：

U_BOOT_CMD(nand, 5, 1, do_nand,

"nand - NAND sub-system\n",

"info - show available NAND devices\n"

"nand device [dev] - show or set current device\n"

"nand read[.jffs2] - addr off|partition size\n"

"nand write[.jffs2] - addr off|partiton size - read/write `size' bytes starting\n"

" at offset `off' to/from memory address `addr'\n"

"nand read.yaffs addr off size - read the `size' byte yaffs image starting\n"

" at offset `off' to memory address `addr'\n"

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

" at offset `off' from memory address `addr'\n"

……

然后，在nand命令的处理函数do_nand中增加对“write.yaffs ……”的支持。do_nand函数仍在common/cmd_nand.c中实现，代码修改如下：

331 (!strcmp(s, ".jffs2") || !strcmp(s, ".e") || !strcmp(s, ".i"))) {

……

354 }else if ( s != NULL && !strcmp(s, ".yaffs")){

355 if (read) {

356 /* read */

357 nand_read_options_t opts;

358 memset(&opts, 0, sizeof(opts));

359 opts.buffer = (u_char*) addr;

360 opts.length = size;

361 opts.offset = off;

362 opts.readoob = 1;

363 opts.quiet = quiet;

364 ret = nand_read_opts(nand, &opts);

365 } else {

366 /* write */

367 nand_write_options_t opts;

368 memset(&opts, 0, sizeof(opts));

369 opts.buffer = (u_char*) addr;/* yaffs文件系统映像存放的地址 */

370 opts.length = size;/* 长度 */

371 opts.offset = off;/* 要烧写到的NAND Flash的偏移地址 */

372 /* opts.forceyaffs = 1; *//* 计算ECC码的方法，没有使用 */

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