问题：使用SD卡启动，就不会不停的打印，即使我输入按键了（貌似可以进入uboot）但是很快u-boot又重启了。
如果是nand启动就没有问题。
求解？？？？？？？？？？
U-Boot 2011.09 (Apr 14 2014 - 15:45:47)
I2C: ready
DRAM: 512 MiB
WARNING: Caches not enabled
Did not find a recognized configuration, assuming General purpose EVM in Profile 0 with Daughter board
NAND: HW ECC Hamming Code selected
256 MiB
MMC: OMAP SD/MMC: 0
*** Warning - bad CRC, using default environment
Net: cpsw
Hit any key to stop autoboot: 3
U-Boot SPL 2011.09 (Apr 14 2014 - 15:45:47)
Texas Instruments Revision detection unimplemented
Booting from MMC...
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img
U-Boot 2011.09 (Apr 14 2014 - 15:45:47)
I2C: ready
DRAM: 512 MiB
WARNING: Caches not enabled
Did not find a recognized configuration, assuming General purpose EVM in Profile 0 with Daughter board
NAND: HW ECC Hamming Code selected
256 MiB
MMC: OMAP SD/MMC: 0
*** Warning - bad CRC, using default environment
Net: cpsw
Hit any key to stop autoboot: 3
U-Boot SPL 2011.09 (Apr 14 2014 - 15:45:47)
Texas Instruments Revision detection unimplemented
Booting from MMC...
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img
