[yocto] Kernel configuration problem/confusion

[Greg Wilson-Lindberg]

Hi Bruce,
First, thanks for the unbelievably quick response.

I searched the Yocto sources and didn't find anything that was trying to manipulate either of the variables except my .cfg.

The memuconfig search for MAX9768 results in:
Symbol: SND_SOC_MAX9768 [=n]
    Type  : tristate
      Defined at sound/soc/codecs/Kconfig:917
      Depends on: SOUND [=y] && !M68K && !UML && SND [=m] && SND_SOC [=m]
      Selected by: SND_SOC_ALL_CODECS [=n] && SOUND [=y] && !M68K && !UML && SND [=m] && SND_SOC [=m] && COMPILE_TEST [=n] && I2C [=y]

To my (untrained) eye it seems that I need SND_SOC_ALL_CODECS & COMPILE_TEST. I tried setting them but I get a similar error for COMPILE_TEST. A search for it yields:
 Symbol: COMPILE_TEST [=n]
    Type  : boolean
    Prompt: Compile also drivers which will not load
      Location:
    (1) -> General setup
      Defined at init/Kconfig:56

Which doesn't seem to suggest that there should be any problems setting it.

The search for MAX1363 yields:
 Symbol: MAX1363 [=n]
    Type  : tristate
     Prompt: Maxim max1363 ADC driver
      Location:
        -> Device Drivers
          -> Industrial I/O support (IIO [=m])
    (1)     -> Analog to digital converters
      Defined at drivers/iio/adc/Kconfig:218
      Depends on: IIO [=m] && I2C [=y]
      Selects: IIO_BUFFER [=y] && IIO_TRIGGERED_BUFFER [=n]

Which doesn't seem to me reveal any reason that I shouldn't be able to set it.

Regards,
Greg
________________________________
From: Bruce Ashfield <bruce.ashfield at windriver.com>
Sent: Friday, December 22, 2017 12:27:22 PM
To: Greg Wilson-Lindberg; yocto at yoctoproject.org
Subject: Re: [yocto] Kernel configuration problem/confusion



On 12/22/2017 3:51 PM, Greg Wilson-Lindberg wrote:
> I'm trying to add some kernel configuration to a Raspberry pi3 yocto
> build.  I've got the .cfg fragment being read in, but I'm getting
> warnings that indicate that they are not making the desired changes.
>
>
> The first one is CONFIG_SND_SOC_MAX9768. This is a sound codec and the
> Kconfig file has it in a long list of select's. the one for the MAX9768 is:
>
>      select CONFIG_SND_SOC_MAX9768 if I2C
>
> I2C is set, but CONFIG_SND_SOC_MAX9768 ends up undefined. the warning
> I'm getting is:
>
> ---------- CONFIG_SND_SOC_MAX9768 -----------------
> Config: CONFIG_SND_SOC_MAX9768
> From:
> /home/gwilson/Qt-5.9/Yocto-build-RPi3/build-raspberrypi3/tmp/work-shared/raspberrypi3/kernel-source/.kernel-meta/configs/Scribe.cfg
> Requested value:  CONFIG_SND_SOC_MAX9768=y
> Actual value:
>
> Config 'SND_SOC_MAX9768' has the following conditionals:
> Dependency values are:
>
> SND_SOC_MAX9768 ends up not being selected even though I try to set it
> ti 'y'
>
>
> The second one is CONFIG_MAX1363, this is an ADC that I'm trying to set,
> the warning is:
>
> ---------- CONFIG_MAX1363 -----------------
> Config: CONFIG_MAX1363
> From:
> /home/gwilson/Qt-5.9/Yocto-build-RPi3/build-raspberrypi3/tmp/work-shared/raspberrypi3/kernel-source/.kernel-meta/configs/Scribe.cfg
> Requested value:  CONFIG_MAX1363=y
> Actual value:     # CONFIG_MAX1363 is not set
>
> Config 'MAX1363' has the following conditionals:
>    I2C (value: "y")
> Dependency values are:
>    I2C [y]
>
> It ends up being not set. In both cases the value that I'm trying to set
> is ignored. Any insight would be greatly appreciated.

The python library that tries to detangle the Kconfig dependencies
isn't perfect (but I do have an update for it pending), so you might
not be getting the entire story in that information dumb.

Two things to check:

  - there are no other fragments that are disabling the same option
  - use menuconfig in the kernel to search the option and see what it
    reports for the dependencies.

There's some constraint or overriding command that is not allowing the
option into the final config, we just need to track it down.

Bruce

>
>
> Regards,
>
> Greg
>
>
>
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