k2hk EV开发板，测试4.0.0.4 SDK，编译bootmonitor和uboot后，引导系统没有问题，但是引导根文件系统报错，不论采用tisdk-server-extra-rootfs-image-k2hk-evm.tar.xz还是采用tisdk-server-rootfs-image-k2hk-evm.tar.xz都报错，不能进入正常的rootfs，能进入shell，如下：
[FAILED] Failed to mount /media/ram.
See 'systemctl status media-ram.mount' for details.
[DEPEND 8.655314] random: fast init done
[0m] Dependency failed for Local File Systems.
[ 8.694489] systemd-journald[125]: Received request to flush runtime journal from PID 1
[ OK ] Reached target Timers.
[ OK ] Closed Syslog Socket.
[ OK ] Reached target Sockets.
Starting Commit a transient machine-id on disk...
Starting Rebuild Dynamic Linker Cache...
Starting Rebuild Journal Catalog...
[ OK ] Started Emergency Shell.
[ OK ] Reached target Emergency Mode.
[ OK ] Reached target Login Prompts.
Starting Network Service...
Starting Load/Save Random Seed...
[ OK ] Started Flush Journal to Persistent Storage.
[FAILED] Failed to start Commit a transient machine-id on disk.
See 'systemctl status systemd-machine-id-commit.service' for details.
[FAILED] Failed to start Rebuild Journal Catalog.
See 'systemctl status systemd-journal-catalog-update.service' for details.
[ OK ] Started Load/Save Random Seed.
[ OK ] Started Network Service.
[ OK ] Reached target Network.
Starting Create Volatile Files and Directories...
[FAILED] Failed to start Create Volatile Files and Directories.
See 'systemctl status systemd-tmpfiles-setup.service' for details.
Starting Update UTMP about System Boot/Shutdown...
Starting Network Time Synchronization...
[ OK ] Started Update UTMP about System Boot/Shutdown.
Starting Update UTMP about System Runlevel Changes...
[ OK ] Started Update UTMP about System Runlevel Changes.
