Linux/AM3358: Suspend mode issue

Hi Pavel,

Thanks for your response. I get same result :

root@am335x-evm:~# echo mem > /sys/power/state
-sh: echo: write error: Invalid argument

Thanks

Saurabh

Maybe your terminal program is sending a "newline" character. Try

echo -n mem >/sys/power/state

Steve K.

Hi,
None of these options work . Are you able to try this at your end on bbb ?

Thanks
Saurabh

Hi,
I tested on my BBB with SDK 4.2, and it worked:

root@am335x-evm:~# echo mem >/sys/power/state
[ 154.033756] PM: Syncing filesystems ... done.
[ 154.168974] Freezing user space processes ... (elapsed 0.002 seconds) done.
[ 154.170455] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) do
ne.
[ 154.170516] Suspending console(s) (use no_console_suspend to debug)
[ 155.529945] PM: suspend of devices complete after 1332.811 msecs
[ 155.534134] PM: late suspend of devices complete after 4.137 msecs
[ 155.538175] PM: noirq suspend of devices complete after 3.996 msecs
[ 155.538191] PM: Successfully put all powerdomains to target state
[ 155.538191] PM: Wakeup source UART
[ 155.556726] PM: noirq resume of devices complete after 18.345 msecs
[ 155.560443] PM: early resume of devices complete after 3.380 msecs
[ 155.561942] net eth0: initializing cpsw version 1.12 (0)
[ 155.561967] cpsw 4a100000.ethernet: initialized cpsw ale version 1.4
[ 155.561983] cpsw 4a100000.ethernet: ALE Table size 1024
[ 155.662924] SMSC LAN8710/LAN8720 4a101000.mdio:00: attached PHY driver [SMSC
LAN8710/LAN8720] (mii_bus:phy_addr=4a101000.mdio:00, irq=-1)
[ 155.667289] cpts ptp bc clkid 0
[ 155.672877] Suspended for 2.419 seconds
[ 155.792447] PM: resume of devices complete after 231.966 msecs
[ 155.880178] Restarting tasks ... done.
root@am335x-evm:~#

Which Element 14 Cape? I am sure that is not the problem, but take it off and see if anything changes.

Steve K.

Thanks Steve, Kemal

-"Suspend to RAM and standby" is enabled. I haven't changed any power related configs that come default with sdk. I have attached snapshot

- it fails on bbb w/o e-14 cape as well

One difference i can think of is that i am booting bbb using SD card and not flashing image on eMMC since WiLink8 uses same MMC controller as eMMC on bbb. Could that be the reason ?

Thanks

Saurabh

 

Saurabh,

I am booting BBB board with AM335x rev 2.1 device on it. I am booting from SD card only, no eMMC involved. I am using AM335x TI PSDK 4.02 with the pre-built images. And I can successfully suspend/resume BBB board. See the attached log file.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/BBB_5F00_log

I have no capes on BBB board.

Make sure you are using create-sdcard.sh script to create your bootable SD card.

Regards,
Pavel