pocket beagle not clean shutdown?

[Fred Kerr]

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] [<c0114468>] (unwind_backtrace) from [<c010dd20>] (show_stack+0x)

[85063.428686] [<c010dd20>] (show_stack) from [<c07451e0>] (dump_stack+0x80/0x9)

[85063.436003] [<c07451e0>] (dump_stack) from [<c0272c90>] (panic+0x100/0x28c)

[85063.443055] [<c0272c90>] (panic) from [<c0144220>] (complete_and_exit+0x0/0x)

[85063.450450] [<c0144220>] (complete_and_exit) from [<c0165b88>] (SyS_reboot+0)

[85063.458545] [<c0165b88>] (SyS_reboot) from [<c0108f80>] (ret_fast_syscall+0x)

[85063.466330] ---[ end Kernel panic - not syncing: Attempted to kill init! exi0

[85063.466330] 

[Robert Nelson]

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,

--
Robert Nelson
https://rcn-ee.com/

[beatb...@gmail.com]

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

[Robert Nelson]

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..

[kristianbe...@gmail.com]

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

[Robert Nelson]

On Tue, Mar 19, 2019 at 1:23 PM <kristianbe...@gmail.com> wrote:
>
> How exactly do i change the value of the register? I have no idea which file to look for

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?

[Robert Nelson]

On Tue, Mar 19, 2019 at 3:09 PM Kristian Bertram
<kristianbe...@gmail.com> wrote:
>
> No, i just have to use kernel 4.9 because og some legacy code unfortunately, so the issues is still there for me

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.