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SD升级问题

Other Parts Discussed in Thread: AM3354

各位:

      我们现在用的是AM3354,系统从sd卡启动,没有用nand,目前sd卡烧写是在PC端,

      请问,能否在不拿出sd卡的情况下,重新烧写uImage文件。

      目前我想到的方法是,在u-boot阶段,通过tftp将文件传入内存,再写入sd卡,

      但是尝试mmc read 时不能成功读出,各位大牛有没有其他的思路,谢谢啦!