之前用的4.5版本emmc 8G，可以正常启动，现在换了一个32g的5.0版本emmc，u-boot启动失败，请问这是为什么呢？？？？
log如下：
H2014.04-svn1 (Feb 27 2017 - 22:03:47)
CPU: Freescale i.MX6Q rev1.5 at 792 MHz
CPU: Temperature 22 C, calibration data: 0x5404c769
Reset cause: POR
Board: MX6-SabreSD
I2C: ready
DRAM: 1 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
MMC init failed
Using default environment
No panel detected: default to Hannstar-XGA
Display: Hannstar-XGA (1024x768)
In: serial
Out: serial
Err: serial
Found PFUZE100 deviceid=10,revid=21
check_and_clean: reg 0, flag_set 0
Fastboot: Normal
flash target is MMC:2
MMC card init failed!
** Block device MMC 2 not supported
Net: Phy not found
PHY reset timed out
FEC [PRIME]
Warning: failed to set MAC address
Normal Boot
Hit any key to stop autoboot: 1 0
booti mmc2
** Block device MMC 2 not supported
fastboot is in init......USB Mini b cable Connected!
fastboot initialized
USB_SUSPEND
USB_RESET
USB_PORT_CHANGE 0x4
USB_RESET
USB_PORT_CHANGE 0x4
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