Pandaboard boot problem

Pandaboard boot problem

[Jean Pihet]

Hi!

I have a problem with a Pandaboard hanging a few seconds after the
kernel boot, likely due to the watchdog firing.
The kernel boots fine, mounts the root FS (initramfs) and the shell
prompt works OK.

Board details: Panda A1, OMAP4430 ES2
Kernel details: l-o tree master, using the omap2plus_defconfig +
initramfs. WDOG is enabled in the config.

>From some investigation I can see that PM runtime disables the wdog
(omap_device_idle). Is that intented?

Any thought?

Thanks,
Jean

Re: Pandaboard boot problem

[Tony Lindgren]

* Jean Pihet <jean.pihet@newoldbits.com> [110201 10:29]:
> Hi!
> 
> I have a problem with a Pandaboard hanging a few seconds after the
> kernel boot, likely due to the watchdog firing.
> The kernel boots fine, mounts the root FS (initramfs) and the shell
> prompt works OK.
> 
> Board details: Panda A1, OMAP4430 ES2
> Kernel details: l-o tree master, using the omap2plus_defconfig +
> initramfs. WDOG is enabled in the config.
> 
> From some investigation I can see that PM runtime disables the wdog
> (omap_device_idle). Is that intented?
> 
> Any thought?

Does it power down after few tens of seconds?

If so, I've seen this same issue few times after having my panda
powered off for a while, for example over the weekend.

What I've noticed is that leaving just u-boot prompt running
for a few minutes cures the problem somehow.. After that the
kernel will boot just fine.

Regards,

Tony

Re: Pandaboard boot problem

[Jean Pihet]

On Fri, Feb 4, 2011 at 2:53 AM, Tony Lindgren <tony@atomide.com> wrote:
> * Jean Pihet <jean.pihet@newoldbits.com> [110201 10:29]:
>> Hi!
>>
>> I have a problem with a Pandaboard hanging a few seconds after the
>> kernel boot, likely due to the watchdog firing.
>> The kernel boots fine, mounts the root FS (initramfs) and the shell
>> prompt works OK.
>>
>> Board details: Panda A1, OMAP4430 ES2
>> Kernel details: l-o tree master, using the omap2plus_defconfig +
>> initramfs. WDOG is enabled in the config.
>>
>> From some investigation I can see that PM runtime disables the wdog
>> (omap_device_idle). Is that intented?
>>
>> Any thought?
>
> Does it power down after few tens of seconds?
Yes

> If so, I've seen this same issue few times after having my panda
> powered off for a while, for example over the weekend.
>
> What I've noticed is that leaving just u-boot prompt running
> for a few minutes cures the problem somehow.. After that the
> kernel will boot just fine.
Unfortunately that is not helping.
I am still investigating. For the moment the pandaboard is pretty useless ;(

>
> Regards,
>
> Tony

Regards,
Jean

Re: Pandaboard boot problem

[Jarkko Nikula]

On Mon, 14 Feb 2011 15:01:30 +0100
Jean Pihet <jean.pihet@newoldbits.com> wrote:

> > If so, I've seen this same issue few times after having my panda
> > powered off for a while, for example over the weekend.
> >
> > What I've noticed is that leaving just u-boot prompt running
> > for a few minutes cures the problem somehow.. After that the
> > kernel will boot just fine.
> Unfortunately that is not helping.
> I am still investigating. For the moment the pandaboard is pretty useless ;(
> 
Try to heat TWL6030 a little. My board seems to suffer some soldering
fault around it and the device keeps running if I warm up the chip with
a 40 W light bulb ~1-2 cm distance.

It keeps running fine by using the Ubuntu kernel but I think reason is
that the EHCI is initialized there and the TWL draws more current and
thus heats up.

No idea why the u-boot runs fine.

-- 
Jarkko

Re: Pandaboard boot problem

[Jean Pihet]

Hi Jarkko,

On Mon, Feb 14, 2011 at 3:38 PM, Jarkko Nikula <jhnikula@gmail.com> wrote:
> On Mon, 14 Feb 2011 15:01:30 +0100
> Jean Pihet <jean.pihet@newoldbits.com> wrote:
>
>> > If so, I've seen this same issue few times after having my panda
>> > powered off for a while, for example over the weekend.
>> >
>> > What I've noticed is that leaving just u-boot prompt running
>> > for a few minutes cures the problem somehow.. After that the
>> > kernel will boot just fine.
>> Unfortunately that is not helping.
>> I am still investigating. For the moment the pandaboard is pretty useless ;(
>>
> Try to heat TWL6030 a little. My board seems to suffer some soldering
> fault around it and the device keeps running if I warm up the chip with
> a 40 W light bulb ~1-2 cm distance.
That works! I heated the chip with a halogen heater at ~10cm distance
and the board ran fine for 3 minutes after that.

> It keeps running fine by using the Ubuntu kernel but I think reason is
> that the EHCI is initialized there and the TWL draws more current and
> thus heats up.
That probably is the reason.

> No idea why the u-boot runs fine.
That would be nice to identify the root cause and get a SW workaround in place.

The other solution is to invest in extra heaters or a sun tan machine
in the office ;p

>
> --
> Jarkko
>

Thanks,
Jean