741n刷了400m的uboot，无法中断

xraybound

我的741nv1.6，刷了yysolid的400muboot，结果不出autobooting in 1 second了，无法中断。咋办？
以下内容无限循环，少了好多东西。


U-Boot 1.1.4 (Dec 11 2010 - 01:32:26)

AP91 (ar7240) U-boot mod by AVBIOS
DRAM:  
sri
#### TAP VALUE 1 = 8, 2 = 9
32 MB
id read 0x100000ff
flash size 4194304, sector count = 64
Flash:  4 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   ag7240_enet_initialize...
No valid address in Flash. Using fixed address