I am using the latest debian image for BBGW from the Beaglebone website.
root@beaglebone:~# uname --all
Linux beaglebone 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l GNU/Linux
root@beaglebone:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 8.7 (jessie)
Release: 8.7
Codename: jessie
I am putting the BBGW board to standby using echo standby > /sys/power/state . I can wakeup the board by applying 3.3V to UART0_RXD or GPIO0_20 pins. But after wakeup the board shuts down.
This log is from the syslog file for the Suspend-Resume cycle:
Feb 9 21:55:03 beaglebone kernel: [ 971.013242] PM: Syncing filesystems … done.
Feb 9 21:55:03 beaglebone kernel: [ 971.038067] PM: Preparing system for sleep (standby)
Feb 9 21:55:23 beaglebone kernel: [ 971.053501] Freezing user space processes … (elapsed 0.004 seconds) done.
Feb 9 21:55:23 beaglebone kernel: [ 971.058349] Freezing remaining freezable tasks … (elapsed 0.002 seconds) done.
Feb 9 21:55:23 beaglebone kernel: [ 971.060889] PM: Suspending system (standby)
Feb 9 21:55:23 beaglebone kernel: [ 971.060995] Suspending console(s) (use no_console_suspend to debug)
Feb 9 21:55:23 beaglebone kernel: [ 971.064716] wlcore: down
Feb 9 21:55:23 beaglebone kernel: [ 971.071999] queueing ieee80211 work while going to suspend
Feb 9 21:55:23 beaglebone kernel: [ 971.072214] queueing ieee80211 work while going to suspend
Feb 9 21:55:23 beaglebone kernel: [ 971.072276] wlcore: down
Feb 9 21:55:23 beaglebone kernel: [ 971.072816] queueing ieee80211 work while going to suspend
Feb 9 21:55:23 beaglebone kernel: [ 971.072844] wlcore: down
Feb 9 21:55:23 beaglebone kernel: [ 971.073358] queueing ieee80211 work while going to suspend
Feb 9 21:55:23 beaglebone kernel: [ 971.237041] PM: suspend of devices complete after 174.137 msecs
Feb 9 21:55:23 beaglebone kernel: [ 971.241369] PM: late suspend of devices complete after 4.278 msecs
Feb 9 21:55:23 beaglebone kernel: [ 971.246404] PM: noirq suspend of devices complete after 4.985 msecs
Feb 9 21:55:23 beaglebone kernel: [ 971.246422] Disabling non-boot CPUs …
Feb 9 21:55:23 beaglebone kernel: [ 971.246433] PM: Successfully put all powerdomains to target state
Feb 9 21:55:23 beaglebone kernel: [ 971.250994] PM: noirq resume of devices complete after 4.279 msecs
Feb 9 21:55:23 beaglebone kernel: [ 971.254810] PM: early resume of devices complete after 3.398 msecs
Feb 9 21:55:23 beaglebone kernel: [ 971.413033] net can0: c_can_hw_raminit_wait_syscon: time out
Feb 9 21:55:23 beaglebone kernel: [ 971.413169] c_can_platform 481cc000.can can0: setting BTR=4503 BRPE=0000
Feb 9 21:55:23 beaglebone kernel: [ 971.416603] net can1: c_can_hw_raminit_wait_syscon: time out
Feb 9 21:55:23 beaglebone kernel: [ 971.416723] c_can_platform 481d0000.can can1: setting BTR=4503 BRPE=0000
Feb 9 21:55:23 beaglebone kernel: [ 971.847640] wlcore: PHY firmware version: Rev 8.2.0.0.236
Feb 9 21:55:23 beaglebone kernel: [ 971.890287] wlcore: firmware booted (Rev 8.9.0.0.69)
Feb 9 21:55:23 beaglebone kernel: [ 976.492451] PM: resume of devices complete after 5237.582 msecs
Feb 9 21:55:23 beaglebone kernel: [ 976.508556] PM: Finishing wakeup.
Feb 9 21:55:23 beaglebone kernel: [ 976.508574] Restarting tasks …
Feb 9 21:55:23 beaglebone kernel: [ 976.509215] usb 1-1: USB disconnect, device number 4
Feb 9 21:55:23 beaglebone rsyslogd-2007: action ‘action 17’ suspended, next retry is Thu Feb 9 21:56:23 2017 [try http://www.rsyslog.com/e/2007 ]
Feb 9 21:55:23 beaglebone kernel: [ 976.543789] done.
Feb 9 21:55:23 beaglebone systemd[1]: Time has been changed
Feb 9 21:55:23 beaglebone systemd[9420]: Time has been changed
Feb 9 21:55:23 beaglebone systemd[1]: Closed Load/Save RF Kill Switch Status /dev/rfkill Watch.
Feb 9 21:55:23 beaglebone kernel: [ 976.747702] usb 1-1: new high-speed USB device number 5 using musb-hdrc
Feb 9 21:55:23 beaglebone systemd[1]: Stopping User Manager for UID 0…
Feb 9 21:55:23 beaglebone systemd[1]: Stopping Session 1 of user root.
Feb 9 21:55:23 beaglebone systemd[1]: Stopped target Bluetooth.
Feb 9 21:55:23 beaglebone systemd[9420]: Reached target Shutdown.
Feb 9 21:55:23 beaglebone systemd[9420]: Stopped target Default.
Feb 9 21:55:23 beaglebone rsyslogd: [origin software=“rsyslogd” swVersion=“8.4.2” x-pid=“752” x-info=“http://www.rsyslog.com”] exiting on signal 15
We can see that the Suspend-Resume cycle is successful but nevertheless it shuts down after resume.
I have tested the same image with BBB, and everything works fine in it. I can successfully resume from standby mode without shut down.
I have also tried using different kernel images from beaglebone website and i find the same shutdown behaviour in all of them. Also it works fine with BBB. My understanding is that both the boards use same SOC AM3358 1GHz ARM® Cortex-A8 and Power Managemnet IC TPS65217C. I am also wondering what is the difference between BBB and BBGW which could cause this behaviour.