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am335x从emmc启动问题

大家好,目前am335x启动方式设计是不是有问题呢?我们SD卡接在MMC0上,emmc接在MMC1上,目前335x支持的启动方式只有SYSBOOT[4:0]=11100b时,才支持从emmc启动吗?因为emmc为8G,根据手册只能接在MMC1上。现在通过SD卡烧写emmc后,emmc不能正常启动,打印log如下,SD启动就很正常。

U-Boot SPL 2016.05-svn59 (Feb 16 2019 - 11:13:13)
Trying to boot from MMC2
reading u-boot.img
spl_load_image_fat: error reading image u-boot.img, err - 0
Failed to mount ext2 filesystem...
spl_load_image_ext: ext4fs mount err - 0

目前启动方式改变了不了,也无法让SD卡在emmc之前启动?请问怎么解决呢?TI为什么不支持mmc1在mmc0之前的启动方式呢?这个设计是不是有点傻?