i.MX ProcessorsのトピックRe: Linux Shutdown command in i.MX6

Linux Shutdown command in i.MX6

ko-hey — Thu, 19 Feb 2015 10:09:12 GMT

Hi all

I want to know about behavior of the PMIC_STBY_REQ.

I designed my board using i.MX 6Solo.

When I use Linux "Shutdown" command, the PMIC_STBY_REQ will be "High".

Is it correct ?

What is a correct behavior when using the "Shutdown" command ?

ko-hey

Re: Linux Shutdown command in i.MX6

igorpadykov — Thu, 19 Feb 2015 11:34:23 GMT

Hi ko-hey

I think one can use "poweroff" command .

Best regards

igor

Re: Linux Shutdown command in i.MX6

matthewsealey — Thu, 19 Feb 2015 21:29:30 GMT

Hello ko-hey,

The status of the PMIC_STBY_REQ (and PMIC_ON_REQ) lines are entirely down to SNVS and CCM configuration settings and which modes will be transitioned through as a result of the kernel "reboot" system call.

The userspace command "shutdown" or "poweroff" really only calls into the kernel as above and will eventually cause something to happen which can easily be board-specific and overridden depending on the kernel version and BSP support in place - it could be the function assigned to pm_power_off() or something more complicated. Usually it will wire up a watchdog timer to reset the system - and what your system does as a result of the timer expiring is usually board-dependent.

You can find very adequate documentation on "Power mode transitions" in the i.MX6 documentation set on what the PMIC_* pin states should be for the internal SoC processes, but which ones the Linux kernel code will configure and invoke is a little more complicated.

Re: Linux Shutdown command in i.MX6

ko-hey — Fri, 20 Feb 2015 01:01:58 GMT

Hi Matthew

Thank you for your quick response and description.

I understand that I need to investigate the kernel.

Thank you.

ko-hey

Re: Linux Shutdown command in i.MX6

ko-hey — Fri, 20 Feb 2015 01:05:34 GMT

Hi Igor

This is just your info.

I tried that command but it's behavior was not change.

Anyway I have already resolved my issue.

Thank you for your Cooperation.

ko-hey

Re: Linux Shutdown command in i.MX6

huyadi — Fri, 15 Jul 2016 01:14:11 GMT

I encounter the same issue as your, would you kind enough to tell me how to poweroff the target? I have filled a question via

Why target fails to power off on IMX6 sabre auto

but, I can't figure out what supporter said, or, which FSL's kernel version can resolve the issue?

Yadi