u-boot没有设置bootargs或参数设置不对引起
SMDK2410的u-boot典型设置
SMDK2410 # printenv
bootargs=root=/dev/mtdblock2 init=/linuxrc console=ttySAC0,115200
baudrate=115200
ethaddr=12:24:56:78:9a:bc
serverip=192.168.1.100
ipaddr=192.168.1.110
bootcmd=nand read 30008000 40000 1c0000 ; go 30008000
bootdelay=2
netmask=255.255.255.0
stdin=serial
stdout=serial
stderr=serial
Environment size: 281/65532 bytes
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