1、在编译配置内核在.config 文件下
CONFIG_CMDLINE="root=/dev/mtdblock1 ro rootfstype=squashfs init=/sbin/init mem=64M console=ttySAK3,115200" //红色处不要设为ttySAK0
2、内核配置
Device Drivers --->
Character devices --->
Serial drivers --->
<*> AK39xx serial port support
[ ] Console on AK39 serial port
[ ] TTY driver to output user messages via printk
3、文件系统修改
修改platform/rootfs/rootfs/inittab 里,把以下行屏蔽掉即可
#ttySAK0::respawn:/sbin/getty -L ttySAK0 115200 vt100 # GENERIC_SERIAL