如题 除此外 会一直显示
U-Boot 2018.01-00569-g7b4e473-dirty (Apr 28 2019 - 15:49:05 +0800)
CPU : AM335X-GP rev 2.1
Model: TI AM335x EVM
DRAM: 512 MiB
NAND: 0 MiB
MMC: OMAP SD/MMC: 0
** Bad device mmc 0 **
Using default environment
<ethaddr> not set. Validating first E-fuse MAC
Net: wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
wait_for_user_access Timeout
