No console output (omap-3.2 branch)

No console output (omap-3.2 branch)

[Andre Puschmann]

Hi list, Steve,

I am trying to boot a kernel I built (using omap2plus_defconfig) based
on Steve's omap-3.2 branch without much success.

I don't get any console output after Uboot finished uncompressing the
kernel. Is there anything I need to configure? The kernel image based on
Tony's tree boots fine on the same hardware (Gumstix Overo Tide)
(despite having MMC issues as mentioned earlier).

Thanks in advance.

-Andre

Re: No console output (omap-3.2 branch)

[Frank Agius]

On 12/10/2011 8:55 AM, Andre Puschmann wrote:
> Hi list, Steve,
>
> I am trying to boot a kernel I built (using omap2plus_defconfig) based
> on Steve's omap-3.2 branch without much success.
>
> I don't get any console output after Uboot finished uncompressing the
> kernel. Is there anything I need to configure? The kernel image based on
> Tony's tree boots fine on the same hardware (Gumstix Overo Tide)
> (despite having MMC issues as mentioned earlier).

I ran into the same problem you described. Steve's tree has some patches 
that are not in mainline 3.2.  I tracked the hang down to one of those 
patches that added support for 720Mhz capable hardware.  The
kernel reads the status register and determines that the CPU can support 
720Mhz (omap3_check_features).  From what I can tell, the check is done 
correctly (variable status in omap3_check_features is set to 0x08, which 
looks like the right bit for 720Mhz support).  Since the kernel thinks 
that 720Mhz is supported, it calls omap3_opp_enable_720Mhz (file 
opp3xx_data.c).  The kernel dies silently when it calls the opp enable 
for 720Mhz, at or near line 178:

176                 pdev = &oh_mpu->od->pdev;
177
178                 r = opp_enable(&pdev->dev, 720000000);

That's as far as I can take the debug.  I'm going to disable the check
for 720Mhz in my local tree until this can get sorted out.


frank

Re: No console output (omap-3.2 branch)

[Andre Puschmann]

On 01/25/2012 11:15 PM, Frank Agius wrote:
> On 12/10/2011 8:55 AM, Andre Puschmann wrote:
>> Hi list, Steve,
>>
>> I am trying to boot a kernel I built (using omap2plus_defconfig) based
>> on Steve's omap-3.2 branch without much success.
>>
>> I don't get any console output after Uboot finished uncompressing the
>> kernel. Is there anything I need to configure? The kernel image based on
>> Tony's tree boots fine on the same hardware (Gumstix Overo Tide)
>> (despite having MMC issues as mentioned earlier).
> 
> I ran into the same problem you described. Steve's tree has some patches
> that are not in mainline 3.2.  I tracked the hang down to one of those
> patches that added support for 720Mhz capable hardware.  The
> kernel reads the status register and determines that the CPU can support
> 720Mhz (omap3_check_features).  From what I can tell, the check is done
> correctly (variable status in omap3_check_features is set to 0x08, which
> looks like the right bit for 720Mhz support).  Since the kernel thinks
> that 720Mhz is supported, it calls omap3_opp_enable_720Mhz (file
> opp3xx_data.c).  The kernel dies silently when it calls the opp enable
> for 720Mhz, at or near line 178:
> 
> 176                 pdev = &oh_mpu->od->pdev;
> 177
> 178                 r = opp_enable(&pdev->dev, 720000000);
> 
> That's as far as I can take the debug.  I'm going to disable the check
> for 720Mhz in my local tree until this can get sorted out.

Just wanted to mention that the bug is still present here, too.
Interestingly, the same code seems to work in the omap-3.0pm tree and
the kernel boots fine. So disabling 720MHz support might just hide the
real cause.

-Andre

Re: No console output (omap-3.2 branch)

[Belisko Marek]

On Thu, Jan 26, 2012 at 11:13 AM, Andre Puschmann
<andre.puschmann@tu-ilmenau.de> wrote:
> On 01/25/2012 11:15 PM, Frank Agius wrote:
>> On 12/10/2011 8:55 AM, Andre Puschmann wrote:
>>> Hi list, Steve,
>>>
>>> I am trying to boot a kernel I built (using omap2plus_defconfig) based
>>> on Steve's omap-3.2 branch without much success.
>>>
>>> I don't get any console output after Uboot finished uncompressing the
>>> kernel. Is there anything I need to configure? The kernel image based on
>>> Tony's tree boots fine on the same hardware (Gumstix Overo Tide)
>>> (despite having MMC issues as mentioned earlier).
>>
>> I ran into the same problem you described. Steve's tree has some patches
>> that are not in mainline 3.2.  I tracked the hang down to one of those
>> patches that added support for 720Mhz capable hardware.  The
>> kernel reads the status register and determines that the CPU can support
>> 720Mhz (omap3_check_features).  From what I can tell, the check is done
>> correctly (variable status in omap3_check_features is set to 0x08, which
>> looks like the right bit for 720Mhz support).  Since the kernel thinks
>> that 720Mhz is supported, it calls omap3_opp_enable_720Mhz (file
>> opp3xx_data.c).  The kernel dies silently when it calls the opp enable
>> for 720Mhz, at or near line 178:
>>
>> 176                 pdev = &oh_mpu->od->pdev;
>> 177
>> 178                 r = opp_enable(&pdev->dev, 720000000);
>>
>> That's as far as I can take the debug.  I'm going to disable the check
>> for 720Mhz in my local tree until this can get sorted out.
>
Could this be related to same problem? :
http://marc.info/?l=linux-omap&m=132756359017621&w=2
> Just wanted to mention that the bug is still present here, too.
> Interestingly, the same code seems to work in the omap-3.0pm tree and
> the kernel boots fine. So disabling 720MHz support might just hide the
> real cause.
>
> -Andre
>
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marek

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