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1.SD卡的只读打开了
2.不排除SD卡有问题了,更换SD卡重新做一张启动卡和文件系统
3.看下内核这个地方是否有影响
drivers/mmc/card/block.c文件,去掉只读模式,
static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) {
… /* * Set the read-only status based on the supported commands * and the write protect switch. */
//md->read_only = mmc_blk_readonly(card);
… }