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AM335x Beaglebone Black eMMC 启动进uboot执行 saveenv时出错

AM335x Beaglebone Black eMMC 启动进uboot执行 saveenv时出错,

部分log如下:

OMAP SD/MMC: 0, OMAP SD/MMC: 1
initcall: 80803005 (relocated to 9fdd0005)
Card did not respond to voltage select!
mmc_init: -17, time 13
** Bad device mmc 0 **

请问各位大侠,这个是什么原因呢?