修复U-Boot中不页对齐不能烧写的问题

drivers/mtd/nand/nand_util.c

472 int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length_i,
473             u_char *buffer)
474 {
475         int rval;
476         //size_t left_to_write = *length;
477         size_t len_incl_bad;
478         u_char *p_buffer = buffer;
479
480 #if 1 //ABING Fixed NOT align filesize
481
482         size_t *length;
483        size_t page_size = nand->writesize;
484         size_t page_num = *length_i/page_size;
485         size_t n = *length_i;
486     size_t left_to_write;
487
488         if (*length_i % (page_size) != 0) {
489                 printf("Not align, modified\n");
490                n = (page_num + 1) * page_size;
491         }
492
493         length = &n;
494        left_to_write = n;
495 #endif
496
497         /* Reject writes, which are not page aligned */
498        if ((offset & (nand->writesize - 1)) != 0 ||
499               (*length & (nand->writesize - 1)) != 0) {
500                     printf ("Attempt to write non page aligned data\n");
501                    return -EINVAL;
502         }

其实还可以用更简单的办法，就是如果长度不对齐，则将长度或上页大小即可：

497     if (*length % (page_size) != 0) {
498             left_to_write = *length | nand->writesize;
left_to_write += 1;
499     }

用这种方法无需改动函数原型的参数名称，也更简洁。

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