我将u-boot从2016.03升级到2017.09之后，系统无法启动。下面是错误信息。u-boot未能识别SD卡吗？大概问题出在什么地方？
Trying to boot from MMC1
MMC Device 0 not found
spl: could not find mmc device. error: -19
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###
我将u-boot从2016.03升级到2017.09之后，系统无法启动。下面是错误信息。u-boot未能识别SD卡吗？大概问题出在什么地方？
Trying to boot from MMC1
MMC Device 0 not found
spl: could not find mmc device. error: -19
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###
