USB Mode: Waiting...，怎么回事。

Superboot-210
Ver: 1.21a(20140102)
CPU: S5PV210 1GHz
RAM: 512MB
NAND: 1GB(SLC) ID:ECD35195
Touch Device: no 1-wire
LCD Type: S70(Manu)

Installing OS 'LINUX'
Installing bootloader...
file: /images/Superboot210.bin: 528 KB(540672 Byte)
Installing bootloader succeed
Installing kernel...
file: /images/Linux/zImage: 4 MB(4823568 Byte)
Installing kernel succeed
Installing yaffs2-image...
file: /images/Linux/rootfs_qt4.img: 301 MB(315644736 Byte)
Skip block 0x00000167
Skip block 0x000001DB
Skip block 0x000001FF
Skip block 0x00000334
Skip block 0x000003F7
Skip block 0x000007F7
Installing yaffs2-image succeed
OS 'LINUX' Installed
Booting from NAND

Superboot-210
Ver: 1.21a(20140102)
CPU: S5PV210 1GHz
RAM: 512MB
NAND: 1GB(SLC) ID:ECD35195
Touch Device: no 1-wire
LCD Type: Unknown

USB Mode: Waiting...


自己做的底板，烧写可以，但是选择从nand中启动时，就一直显示USB Mode: Waiting...，我的固件在tiny210的官方板上就是可以直接启动的。

USB Mode: Waiting...，不是只有在SD卡中加入USB选项才会有的吗，怎么从nand中启动也有呢。

另：原来的核心板中带有android，是可以直接启动的。

谢谢！已经运行！！

Booting from NAND
Load Kernel...
Uncompressing Linux... done, booting the kernel.
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.0.8-FriendlyARM-svn1 (auto@Auto-Server) (gcc version 4.5.1 (ctng-1.8.1-FA) ) #6 PREEMPT Fri Jun 13 17:19:45 CST 2014
[    0.000000] CPU: ARMv7 Processor [412fc082] revision 2 (ARMv7), cr=10c53c7f
[    0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine: MINI210
[    0.000000] MINI210: S70 selected
[    0.000000] Memory policy: ECC disabled, Data cache writeback
[    0.000000] CPU S5PV210/S5PC110 (id 0x43110220)