pocket beagle not clean shutdown?

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1

Using the serial connection to bacon bits cape to pocket beagle, it seems that it doesn’t shut down cleanly?

debian@beaglebone:~/src$ sudo shutdown -h now
[85060.880449] reboot: Power down
[85063.372620] rtc_power_off failed, bailing out.
[85063.398178] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00
[85063.398178]
[85063.407436] CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 4.9.82-ti-r102 #1
[85063.414625] Hardware name: Generic AM33XX (Flattened Device Tree)
[85063.420846] [] (unwind_backtrace) from [] (show_stack+0x)
[85063.428686] [] (show_stack) from [] (dump_stack+0x80/0x9)
[85063.436003] [] (dump_stack) from [] (panic+0x100/0x28c)
[85063.443055] [] (panic) from [] (complete_and_exit+0x0/0x)
[85063.450450] [] (complete_and_exit) from [] (SyS_reboot+0)
[85063.458545] [] (SyS_reboot) from [] (ret_fast_syscall+0x)
[85063.466330] —[ end Kernel panic - not syncing: Attempted to kill init! exi0
[85063.466330]

2

It's fine, the mmc/drive was already down.

We just need to figure out the proper way to tell the RTC to power off
the unit..

Regards,

3

The problem seems to be, that the rtc has no active oscillator:
If I set RTC_OSC_REG to 0x40 (internal oscillator) shutdown works normal.
But I’m not sure whether this is the correct way to solve this issue.

Regards
Beat Bieler

4

Thanks guys, with the help of Matthijs, we have this implement in
u-boot and the kernel..

My PocketBeagle now shut's down..

You can get the updated bootloader via:

debian@beaglebone:~$ sudo /opt/scripts/tools/developers/update_bootloader.sh

I've also add a print statement about the RTC

U-Boot 2018.03-00002-gac9cce7c6a (Apr 05 2018 - 13:07:46 -0500),
Build: jenkins-github_Bootloader-Builder-47

CPU : AM335X-GP rev 2.1
I2C: ready
DRAM: 512 MiB
No match for driver 'omap_hsmmc'
No match for driver 'omap_hsmmc'
Some drivers were not found
Reset Source: Power-on reset has occurred.
RTC 32KCLK Source: Internal. <-------------------

Pocket: Internal
BeagleBone Black: External

Right now only v4.16.0-bone7 has the kernel change, and it's building right now

http://gfnd.rcn-ee.org:81/farm/deb/

I'll start the backport shortly to previous kernels..

Regards,

5

How exactly do i change the value of the register? I have no idea which file to look for

onsdag den 4. april 2018 kl. 15.55.41 UTC+2 skrev beatb...@gmail.com:

6

The default BeagleBoard images already take care of this issue now..

Are you trying to modify that register in a non-u-boot, non-linux OS?

Regards,

7

Well it's a two part fix.

1: u-boot has to set the correct rtc bit:

https://github.com/RobertCNelson/Bootloader-Builder/blob/master/patches/v2018.09/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L173-L195

2: the kernel has to have the correct bit set:

https://github.com/beagleboard/linux/blob/4.9/arch/arm/boot/dts/am335x-pocketbeagle-common.dtsi#L1127-L1129

When those two are set, it'll properly shutdown.

Regards,