U-Boot NAND Flash 分区代码实现 - 如何在 U-Boot 中为 NAND Flash 添加分区

{"title":"U-Boot NAND Flash 分区代码实现 - 如何在 U-Boot 中为 NAND Flash 添加分区","description":"本文介绍如何在 U-Boot 中为 NAND Flash 添加分区，并提供修改 "nand_spl_load_image()" 和 "nand_load()" 函数的具体代码示例。","keywords":"U-Boot, NAND Flash, 分区, nand_spl_load_image, nand_load, 代码实现","content":"在 U-Boot 中给 NAND Flash 添加分区，需要修改 nand_spl_load_image() 函数和 nand_load() 函数。以下是具体的代码实现：\n\n1. 修改 nand_spl_load_image() 函数：\nc\nint nand_spl_load_image(void *dst, unsigned long size, unsigned long offset)\n{\n int ret;\n int dev = nand_curr_device;\n\n ret = nand_spl_load_image_raw(nand_info[dev], offset, size, dst);\n if (ret < 0) {\n printf("spl: error reading image %d, errno %d\n", ret, errno);\n return -1;\n }\n\n return ret;\n}\n\n\n2. 修改 nand_load() 函数：\nc\nint nand_load(char *dest, unsigned long *sz, unsigned long *offs)\n{\n int ret;\n int dev = nand_curr_device;\n loff_t off;\n u32 size;\n ulong len;\n uchar *dst = (uchar *)dest;\n\n off = *offs;\n size = *sz;\n\n if (off >= nand_info[dev]->size || *sz > nand_info[dev]->size ||\n off + *sz > nand_info[dev]->size) {\n printf("spl: error reading image, invalid offset or size\n");\n return -1;\n }\n\n /* Check if offset is block-aligned */\n if (off & (nand_info[dev]->erasesize - 1)) {\n printf("spl: error reading image, offset is not block-aligned\n");\n return -1;\n }\n\n /* Check if size is page-aligned */\n if (size & (nand_info[dev]->writesize - 1)) {\n printf("spl: error reading image, size is not page-aligned\n");\n return -1;\n }\n\n for (len = 0; len < size; len += nand_info[dev]->writesize) {\n ret = nand_read_skip_bad(nand_info[dev], off + len, &nand_info[dev]->writesize,\n NULL, nand_info[dev]->writesize, dst + len);\n if (ret) {\n printf("spl: error reading image %d, errno %d\n", ret, errno);\n return -1;\n }\n }\n\n *sz = size;\n *offs = off;\n\n return ret;\n}\n\n\n以上代码修改了 nand_spl_load_image() 函数和 nand_load() 函数，使得在读取 NAND Flash 时可以支持分区。"}