Boot from SD card, execute reboot from command line, it hang with below message, the same result on both E3 and E4 board:
root@am65xx-evm:/# reboot
Stopping Session c2 of user root.
[ OK ] Removed slice system-systemd\x2dcoredump.slice.
[ OK ] Removed slice system-weston.slice.
[ OK ] Stopped target RPC Port Mapper.
[ OK ] Stopped target Timers.
[ OK ] Stopped Daily rotation of log files.
[ OK ] Stopped Daily Cleanup of Temporary Directories.
Stopping Reboot and dump vmcore via kexec...
Stopping NFS status monitor for NFSv2/3 locking....
Stopping Load/Save Random Seed...
[ OK ] Stopped target Login Prompts.
Stopping Job spooling tools...
Stopping Avahi mDNS/DNS-SD Stack...
Stopping Periodic Command Scheduler...
Stopping Getty on tty1...
Stopping irqbalance daemon...
[ OK ] Stopped Matrix GUI.
Stopping Serial Getty on ttyS1...
Stopping Serial Getty on ttyS2...
Stopping Simple Network Ma…ent Protocol (SNMP) Daemon....
[ OK ] Stopped target System Time Synchronized.
[ OK ] Stopped target System Time Set.
Stopping telnetd.service...
[ OK ] Stopped Job spooling tools.
[ OK ] Stopped Periodic Command Scheduler.
[ OK ] Stopped Wait for Network to be Configured.
[ OK ] Stopped Avahi mDNS/DNS-SD Stack.
[ OK ] Stopped Getty on tty1.
[ OK ] Stopped Serial Getty on ttyS1.
[ OK ] Stopped Serial Getty on ttyS2.
[ OK ] Removed slice system-getty.slice.
[ OK ] Removed slice system-serial\x2dgetty.slice.
[ OK ] Stopped irqbalance daemon.
[ OK ] Stopped NFS status monitor for NFSv2/3 locking..
[ OK ] Stopped Session c2 of user root.
[ OK ] Stopped telnetd.service.
[ OK ] Stopped target Host and Network Name Lookups.
Stopping Login Service...
Stopping User Manager for UID 0...
Stopping weston.service...
[ OK ] Stopped Load/Save Random Seed.
[ OK ] Stopped User Manager for UID 0.
[ OK ] Stopped Reboot and dump vmcore via kexec.
[ OK ] Stopped weston.service.
Stopping rc.pvr.service...
Stopping User Runtime Directory /run/user/0...
[ OK ] Unmounted /run/user/0.
[ OK ] Stopped Login Service.
[ OK ] Stopped User Runtime Directory /run/user/0.
[ OK ] Removed slice User Slice of UID 0.
Stopping D-Bus System Message Bus...
Stopping Permit User Sessions...
[ OK ] Stopped D-Bus System Message Bus.
[ OK ] Stopped Simple Network Man…ement Protocol (SNMP) Daemon..
[ OK ] Stopped rc.pvr.service.
[ OK ] Stopped Permit User Sessions.
[ OK ] Stopped target Network.
[ OK ] Stopped target Remote File Systems.
Stopping Network Name Resolution...
[ OK ] Stopped Network Name Resolution.
Stopping Network Service...
[ OK ] Stopped Network Service.
[ OK ] Stopped target Network (Pre).
[ OK ] Stopped IPv6 Packet Filtering Framework.
[ OK ] Stopped IPv4 Packet Filtering Framework.
[ OK ] Stopped target Basic System.
[ OK ] Stopped target Paths.
[ OK ] Stopped Dispatch Password …ts to Console Directory Watch.
[ OK ] Stopped Forward Password R…uests to Wall Directory Watch.
[ OK ] Stopped target Slices.
[ OK ] Removed slice User and Session Slice.
[ OK ] Stopped target Sockets.
[ OK ] Closed Avahi mDNS/DNS-SD Stack Activation Socket.
[ OK ] Closed D-Bus System Message Bus Socket.
[ OK ] Closed Docker Socket for the API.
[ OK ] Closed dropbear.socket.
[ OK ] Stopped target System Initialization.
Stopping Hardware RNG Entropy Gatherer Daemon...
[ OK ] Stopped Apply Kernel Variables.
[ OK ] Stopped Load Kernel Modules.
Stopping Network Time Synchronization...
[ OK ] Stopped Hardware RNG Entropy Gatherer Daemon.
[ OK ] Stopped Network Time Synchronization.
[ OK ] Stopped Create Volatile Files and Directories.
[ OK ] Stopped target Local File Systems.
Unmounting /media/ram...
Unmounting /run/media/mmcblk1p1...
Unmounting Temporary Directory (/tmp)...
Unmounting /var/volatile...
[ OK ] Unmounted /media/ram.
[ OK ] Unmounted /run/media/mmcblk1p1.
[ OK ] Unmounted Temporary Directory (/tmp).
[ OK ] Unmounted /var/volatile.
[ OK ] Stopped target Swap.
[ OK ] Reached target Unmount All Filesystems.
[ OK ] Stopped File System Check on /dev/mmcblk1p1.
[ OK ] Removed slice system-systemd\x2dfsck.slice.
[ OK ] Stopped target Local File Systems (Pre).
[ OK ] Stopped Remount Root and Kernel File Systems.
[ OK ] Stopped Create Static Device Nodes in /dev.
[ OK ] Reached target Shutdown.
[ OK ] Reached target Final Step.
[ OK ] Started Reboot.
[ OK ] Reached target Reboot.
[ 39.936303] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 40.019687] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[ 40.040411] systemd-journald[177]: Received SIGTERM from PID 1 (systemd-shutdow).
[ 40.064999] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[ 40.085619] systemd-shutdown[1]: Unmounting file systems.
[ 40.094503] [1122]: Remounting '/' read-only in with options '(null)'.
[ 40.132716] EXT4-fs (mmcblk1p2): re-mounted. Opts: (null)
[ 40.141992] systemd-shutdown[1]: All filesystems unmounted.
[ 40.147633] systemd-shutdown[1]: Deactivating swaps.
[ 40.152825] systemd-shutdown[1]: All swaps deactivated.
[ 40.158077] systemd-shutdown[1]: Detaching loop devices.
[ 40.168285] systemd-shutdown[1]: All loop devices detached.
[ 40.173900] systemd-shutdown[1]: Detaching DM devices.
[ 40.179437] systemd-shutdown[1]: All DM devices detached.
[ 40.184859] systemd-shutdown[1]: All filesystems, swaps, loop devices and DM devices detached.
[ 40.204492] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 40.211461] systemd-shutdown[1]: Rebooting.
[ 40.241162] reboot: Restarting system
hang here
