提示信息为：
CPU: Freescale i.MX6ULL rev1.0 528 MHz (running at 396 MHz)
CPU: Commercial temperature grade (0C to 95C) at 49C
Reset cause: POR
Board: MYS-MX6ULL 14x14
I2C: ready
DRAM: 256 MiB
NAND: 256 MiB
MMC: FSL_SDHC: 0
*** Warning - bad CRC, using default environment
Display: TFT43AB (480x272)
Video: 480x272x24
In: serial
Out: serial
Err: serial
Net: FEC0
Error: FEC0 address not set.
Normal Boot
Hit any key to stop autoboot: 0
=> (?at 396 MHz
Unknown command '(?at' - try 'help'
不知道这是什么原因造成的。
