我正在开发一个基于 Olinuxino 板的简单嵌入式系统。它具有板载串行控制台接头。TX 和 RX 都连接到微控制器上的相应引脚(即这不是硬件问题)。
连接后,我可以看到启动的 Linux 系统的正常输出,但在任何时候我都没有登录。似乎没有其他输入
可以使用什么机制来阻止串行控制台在 Linux 系统上接受输入?
具体情况
设备正在使用 busybox,而 inittab 看起来像这样:
# /etc/inittab: init(8) configuration.
# $Id: inittab,v 1.91 2002/01/25 13:35:21 miquels Exp $
# The default runlevel.
id:5:initdefault:
# Boot-time system configuration/initialization script.
# This is run first except when booting in emergency (-b) mode.
si::sysinit:/etc/init.d/rcS
# What to do in single-user mode.
~~:S:wait:/sbin/sulogin
# /etc/init.d executes the S and K scripts upon change
# of runlevel.
#
# Runlevel 0 is halt.
# Runlevel 1 is single-user.
# Runlevels 2-5 are multi-user.
# Runlevel 6 is reboot.
l0:0:wait:/etc/init.d/rc 0
l1:1:wait:/etc/init.d/rc 1
l2:2:wait:/etc/init.d/rc 2
l3:3:wait:/etc/init.d/rc 3
l4:4:wait:/etc/init.d/rc 4
l5:5:wait:/etc/init.d/rc 5
l6:6:wait:/etc/init.d/rc 6
# Normally not reached, but fallthrough in case of emergency.
z6:6:respawn:/sbin/sulogin
S:2345:respawn:/sbin/getty 115200 ttyAMA0
# /sbin/getty invocations for the runlevels.
#
# The "id" field MUST be the same as the last
# characters of the device (after "tty").
#
# Format:
# <id>:<runlevels>:<action>:<process>
#
1:2345:respawn:/sbin/getty 38400 tty1
/sbin/getty 链接到 /sbin/getty.tinylogin 链接到 /bin/tinylogin
传递给内核的选项是:
[ 0.000000] Kernel command line: console=ttyAMA0,115200 root=/dev/mmcblk0p2 rw rootwait ssp1=mmc lcd_panel=lms430 no_console_suspend
不确定速度的差异是否会导致这不起作用。