显示下面这些错误，是怎么回事？
U-Boot 2010.12 (Nov 25 2015 - 16:30:50) for TINY4412
CPU: S5PC220 [Samsung SOC on SMP Platform Base on ARM CortexA9]
APLL = 1000MHz, MPLL = 800MHz
Board: TINY4412
DRAM: 1023 MiB
vdd_arm: 1.2
vdd_int: 1.0
vdd_mif: 1.1
BL1 version: N/A (TrustZone Enabled BSP)
Checking Boot Mode ... SDMMC
REVISION: 1.1
MMC Device 0: 7580 MB
unrecognised EXT_CSD structure version 7
FAIL: waiting for status update.
MMC Device 1: 1024 MB
MMC Device 2: N/A
Net: No ethernet found.
