在插上SD卡启动uboot时的打印信息：
U-Boot SPL 2016.05-00319-g8d0b2ca-dirty (Apr 14 2017 - 16:33:21)
DRA752-GP ES2.0
Trying to boot from MMC1
reading args
spl_load_image_fat_os: error reading image args, err - -1
reading u-boot.img
reading u-boot.img
U-Boot 2016.05-00319-g8d0b2ca-dirty (Apr 14 2017 - 16:33:21 +0800)
CPU : DRA752-GP ES2.0
Board: UNKNOWN(BeagleBoard X15?) REV UNKNOWN
I2C: ready
DRAM: 2 GiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env
SCSI: SATA link 0 timeout.
AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: 64bit ncq stag pm led clo only pmp pio slum part ccc apst
scanning bus for devices...
Found 0 device(s).
Net: cpsw
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
reading boot.scr
** Unable to read file boot.scr **
reading uEnv.txt
** Unable to read file uEnv.txt **
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
** File not found /boot/zImage **
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
** File not found /boot/zImage **
拔出SD卡后在启动uboot，没有启动，也没有任何信息，在emmc上以烧了MLO和u-boot.img
am5726的芯片
SD卡为MMC 0 emmc为MMC 1 请教是什么原因
