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卡在starting kernel的打印信息如下 
U-Boot 2015.04 (Aug 09 2017 - 10:49:37) 
 
CPU:   Freescale i.MX6Q rev1.5 at 792 MHz 
CPU:   Temperature 35 C 
Reset cause: POR 
Board: MX6-SabreSD 
I2C:   ready 
DRAM:  2 GiB 
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2 
*** Warning - bad CRC, using default environment 
 
Display: CLAA-WVGA (800x480) 
asd1 
asd2 
In:    serial 
Out:   serial 
Err:   serial 
switch to partitions #0, OK 
mmc2(part 0) is current device 
check_and_clean: reg 0, flag_set 0 
Fastboot: Normal 
flash target is MMC:2 
Bad partition index:5 for partition:system 
Bad partition index:4 for partition:data 
Net:   setenv ethaddr ea:92:1b:0e:8e:bf;saveenv 
 
Saving Environment to MMC... 
Writing to MMC(2)... done 
FEC [PRIME] 
reading logo.bmp 
** Unable to read file logo.bmp ** 
There is no valid bmp file at the given address 
Normal Boot 
Hit any key to stop autoboot:  0 
reading zImage 
8437728 bytes read in 397 ms (20.3 MiB/s) 
reading imx6q-sabresd.dtb 
44527 bytes read in 18 ms (2.4 MiB/s) 
Kernel image @ 0x12000000 [ 0x000000 - 0x80bfe0 ] 
## Flattened Device Tree blob at 18000000 
   Booting using the fdt blob at 0x18000000 
   Using Device Tree in place at 18000000, end 1800ddee 
 
Starting kernel ... |   
 
 
 
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