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使用BBB自带的Debian系统，有时开机进入到u-boot就停在那了，进不了系统，这可能是什么原因？
是从nand启动 还是sd卡启动
具体停在什么地方，最好把log放上来
系统就进入到这，从SD卡启动的。
BBB默认是从eMMC启动的，你是每次都把sysboot改成SD启动么？
不论是从eMMC中启动板子自带的Debian系统，还是从SD卡中启动的Angstrom系统，都是有时会停在那个地方，
这是从SD卡正常启动Angstrom信息：
U-Boot SPL 2014.04-rc3 (Jul 14 2015 - 15:47:24)
reading args
spl_load_image_fat_os: error reading image args, err - -1
reading u-boot.img
U-Boot 2014.04-rc3 (Jul 14 2015 - 15:47:24)
I2C: ready
DRAM: 512 MiB
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
*** Warning - readenv() failed, using default environment
Net: <ethaddr> not set. Validating first E-fuse MAC
cpsw, usb_ether
Warning: Your board does not use generic board. Please read
doc/README.generic-board and take action. Boards not
upgraded by the late 2014 may break or be removed.
Hit any key to stop autoboot: 0
gpio: pin 53 (gpio 53) value is 1
mmc0 is current device
gpio: pin 54 (gpio 54) value is 1
SD/MMC found on device 0
reading uEnv.txt
246 bytes read in 4 ms (59.6 KiB/s)
gpio: pin 55 (gpio 55) value is 1
Loaded environment from uEnv.txt
Importing environment from mmc ...
Checking if uenvcmd is set ...
gpio: pin 56 (gpio 56) value is 1
Running uenvcmd ...
reading uImage
4404952 bytes read in 401 ms (10.5 MiB/s)
reading am335x-bbb-exp.dtb
23648 bytes read in 9 ms (2.5 MiB/s)
## Booting kernel from Legacy Image at 80007fc0 ...
Image Name: Linux-3.8.13
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 4404888 Bytes = 4.2 MiB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
## Flattened Device Tree blob at 80f80000
Booting using the fdt blob at 0x80f80000
XIP Kernel Image ... OK
Using Device Tree in place at 80f80000, end 80f88c5f
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
有时会停下来？是说是随机现象么？你的BBB板子硬件有做过改动么？
