How to override default Kernel config

How to override default Kernel config

[Henbin Chang]

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Hi,
I would like to enable a specific Kernel config in my machine.
I don't want to modify the 'defconfig'

Could anyone tell me how to do?

Thanks.
BRs,
Henbin.

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Re: How to override default Kernel config

[Lei YU]

> I would like to enable a specific Kernel config in my machine.
> I don't want to modify the 'defconfig'
>
> Could anyone tell me how to do?

Please refer to machine-layer recipes, e.g. meta-romulus' linux recipe:
https://github.com/openbmc/openbmc/tree/master/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/recipes-kernel/linux

Re: How to override default Kernel config

[Henbin Chang]

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Thanks Lei Yu.

Actually, I want to enable CONFIG_DEVMEM in my specific machine.
I added the below config to my machine.cfg
CONFIG_DEVMEM=y
CONFIG_HWMON=y
CONFIG_SENSORS_TMP421=y

But I still saw the line in the ".config" after devtool modify linux-aspeed.
# CONFIG_DEVMEM is not set

How should I do?

Thanks.

2018-07-04 9:39 GMT+08:00 Lei YU <mine260309@gmail.com>:

> > I would like to enable a specific Kernel config in my machine.
> > I don't want to modify the 'defconfig'
> >
> > Could anyone tell me how to do?
>
> Please refer to machine-layer recipes, e.g. meta-romulus' linux recipe:
> https://github.com/openbmc/openbmc/tree/master/meta-openbmc-machines/meta-
> openpower/meta-ibm/meta-romulus/recipes-kernel/linux
>

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Re: How to override default Kernel config

[Lei YU]

On Wed, Jul 4, 2018 at 10:03 AM Henbin Chang <henbinchang@gmail.com> wrote:
>
> Thanks Lei Yu.
>
> Actually, I want to enable CONFIG_DEVMEM in my specific machine.
> I added the below config to my machine.cfg
> CONFIG_DEVMEM=y
> CONFIG_HWMON=y
> CONFIG_SENSORS_TMP421=y
>
> But I still saw the line in the ".config" after devtool modify linux-aspeed.
> # CONFIG_DEVMEM is not set
>
> How should I do?

OK, you are using devtool. Then the simplest you can do is to reset and
modify the recipe again:

    devtool reset linux-aspeed
    # Manullay delete the linux-aspeed dir in workspace
    devtool modify linux-aspeed

Re: How to override default Kernel config

[Henbin Chang]

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Hi Lei Yu,

After following your instructions, the CONFIG_DEVMEM is still not set in
the below '.config'

workspace/sources/linux-aspeed/.config

It did work if I directly
modified meta-openbmc-bsp/meta-aspeed/recipes-kernel/linux/linux-aspeed/ast2500/defconfig

Thanks.

2018-07-04 10:06 GMT+08:00 Lei YU <mine260309@gmail.com>:

> On Wed, Jul 4, 2018 at 10:03 AM Henbin Chang <henbinchang@gmail.com>
> wrote:
> >
> > Thanks Lei Yu.
> >
> > Actually, I want to enable CONFIG_DEVMEM in my specific machine.
> > I added the below config to my machine.cfg
> > CONFIG_DEVMEM=y
> > CONFIG_HWMON=y
> > CONFIG_SENSORS_TMP421=y
> >
> > But I still saw the line in the ".config" after devtool modify
> linux-aspeed.
> > # CONFIG_DEVMEM is not set
> >
> > How should I do?
>
> OK, you are using devtool. Then the simplest you can do is to reset and
> modify the recipe again:
>
>     devtool reset linux-aspeed
>     # Manullay delete the linux-aspeed dir in workspace
>     devtool modify linux-aspeed
>

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Re: How to override default Kernel config

[Lei YU]

> After following your instructions, the CONFIG_DEVMEM is still not set in the below '.config'
>
> workspace/sources/linux-aspeed/.config
>
> It did work if I directly modified meta-openbmc-bsp/meta-aspeed/recipes-kernel/linux/linux-aspeed/ast2500/defconfig

Then you need to make sure if your build config include the machine layer by
checking the build configuration.

E.g. below is meta-romulus' configuration, check if your meta-machine is
correctly included.

    Build Configuration:
    ...
    meta
    meta-poky
    meta-oe
    meta-networking
    meta-perl
    meta-python
    meta-webserver
    meta-virtualization
    meta-phosphor
    meta-aspeed
    meta-openpower
    meta-ibm
    meta-romulus   <== Your meta-machine should appear here.

Btw, what is your machine, is it in OpenBMC tree?

Re: How to override default Kernel config

[Henbin Chang]

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My machine isn't in the OpenBMC tree.

I list the partial contents in my machine layer
  ...
  meta-aspeed \
  meta-x86 \
  meta-x86/meta-mct \
  meta-x86/meta-mct/meta-tiogapass \ -> the last line in the bblayers.conf

In the merge_config_build.log, I find the merging sequence is the below
  Using .kernel-meta/configs//./tiogapass.cfg as base
  Merging .kernel-meta/configs//./phosphor-gpio-keys.cfg
  Merging .kernel-meta/configs//./phosphor-gpio-keys.cfg
  Merging .kernel-meta/configs//./phosphor-vlan.cfg
  Merging .kernel-meta/configs//./phosphor-vlan.cfg
  Merging .kernel-meta/configs//./phosphor-wdt-on-panic.cfg
  Merging .kernel-meta/configs//./phosphor-wdt-on-panic.cfg
  Merging .kernel-meta/configs//./defconfig
  ...

Suppose the CONFIG_DEVMEM=y is removed while 'Merging
.kernel-meta/configs//./defconfig'

Thanks.

2018-07-04 10:34 GMT+08:00 Lei YU <mine260309@gmail.com>:

> > After following your instructions, the CONFIG_DEVMEM is still not set in
> the below '.config'
> >
> > workspace/sources/linux-aspeed/.config
> >
> > It did work if I directly modified meta-openbmc-bsp/meta-aspeed/
> recipes-kernel/linux/linux-aspeed/ast2500/defconfig
>
> Then you need to make sure if your build config include the machine layer
> by
> checking the build configuration.
>
> E.g. below is meta-romulus' configuration, check if your meta-machine is
> correctly included.
>
>     Build Configuration:
>     ...
>     meta
>     meta-poky
>     meta-oe
>     meta-networking
>     meta-perl
>     meta-python
>     meta-webserver
>     meta-virtualization
>     meta-phosphor
>     meta-aspeed
>     meta-openpower
>     meta-ibm
>     meta-romulus   <== Your meta-machine should appear here.
>
> Btw, what is your machine, is it in OpenBMC tree?
>

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Re: How to override default Kernel config

[Henbin Chang]

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I just cloned the latest openbmc REPO and re-did the same modification in
the romulus machine.

I got the same result.

2018-07-04 10:57 GMT+08:00 Henbin Chang <henbinchang@gmail.com>:

> My machine isn't in the OpenBMC tree.
>
> I list the partial contents in my machine layer
>   ...
>   meta-aspeed \
>   meta-x86 \
>   meta-x86/meta-mct \
>   meta-x86/meta-mct/meta-tiogapass \ -> the last line in the bblayers.conf
>
> In the merge_config_build.log, I find the merging sequence is the below
>   Using .kernel-meta/configs//./tiogapass.cfg as base
>   Merging .kernel-meta/configs//./phosphor-gpio-keys.cfg
>   Merging .kernel-meta/configs//./phosphor-gpio-keys.cfg
>   Merging .kernel-meta/configs//./phosphor-vlan.cfg
>   Merging .kernel-meta/configs//./phosphor-vlan.cfg
>   Merging .kernel-meta/configs//./phosphor-wdt-on-panic.cfg
>   Merging .kernel-meta/configs//./phosphor-wdt-on-panic.cfg
>   Merging .kernel-meta/configs//./defconfig
>   ...
>
> Suppose the CONFIG_DEVMEM=y is removed while 'Merging
> .kernel-meta/configs//./defconfig'
>
> Thanks.
>
> 2018-07-04 10:34 GMT+08:00 Lei YU <mine260309@gmail.com>:
>
>> > After following your instructions, the CONFIG_DEVMEM is still not set
>> in the below '.config'
>> >
>> > workspace/sources/linux-aspeed/.config
>> >
>> > It did work if I directly modified meta-openbmc-bsp/meta-aspeed/r
>> ecipes-kernel/linux/linux-aspeed/ast2500/defconfig
>>
>> Then you need to make sure if your build config include the machine layer
>> by
>> checking the build configuration.
>>
>> E.g. below is meta-romulus' configuration, check if your meta-machine is
>> correctly included.
>>
>>     Build Configuration:
>>     ...
>>     meta
>>     meta-poky
>>     meta-oe
>>     meta-networking
>>     meta-perl
>>     meta-python
>>     meta-webserver
>>     meta-virtualization
>>     meta-phosphor
>>     meta-aspeed
>>     meta-openpower
>>     meta-ibm
>>     meta-romulus   <== Your meta-machine should appear here.
>>
>> Btw, what is your machine, is it in OpenBMC tree?
>>
>
>

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