arm移植ubuntu系统出现A start job is running for dev-ttymxc0.device

软件01

主机平台： UBUNTU14.04
硬件平台：明远智睿MY-IMX6-EK200 （其他平台也是）
编译器:      gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz
ARM ubuntu版本：  16.04
内核版本：     linux-4.1.15
很多人遇到移植ubuntu core 16.04的文件系统
启动时遇到长时间等待。如下：
[  OK  ] Started Getty on tty4.
[  OK  ] Started Getty on tty3.
[  OK  ] Started Getty on tty2.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Getty on tty5.
[  OK  ] Started Getty on tty6.
[*     ] A start job is running for dev-ttymx0.device (7s / 1min 30s)

...
...
[     *] A start job is running for dev-ttyPS0.device (1min 29s / 1min 30s)
[ TIME ] Timed out waiting for device dev-ttyPS0.device.
[DEPEND] Dependency failed for Serial Getty on ttyPS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
          Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

1.在/etc/init/ 增加 ttymxc0.conf文件
# console - getty#
# This service maintains a getty on console from the point the system is
# started until it is shut down again.


start on stopped rc RUNLEVEL=[2345] and container CONTAINER=lxc

stop on runlevel [!2345]

respawn
exec /sbin/getty -L 115200 ttymxc0 vt100


2.建立一个软连接
ln -s /lib/systemd/system/getty@.service /etc/systemd/system/getty.target.wants/getty@ttymxc0.service


修改完后和重新烧写，重新启动就不会卡住了。方法适用其他平台的。

jasonhuang1982