[Buildroot] How do I configure the kernel?

[Buildroot] How do I configure the kernel?

[Grant Edwards]

How do you configure the kernel when using buildroot?

I've read through the docs and hunted through the "make
menuconfig" system, but I can't figure out how to configure the
kernel.

I'm trying to build an ARM Integrator image by following the
directions at

http://www.linuxfordevices.com/c/a/Linux-For-Devices-Articles/Getting-started-with-an-embedded-Linux-system-emulator/

But my kernel just locks up solid with absolutely no output.

-- 
Grant Edwards                   grante             Yow! I always have fun
                                  at               because I'm out of my
                               visi.com            mind!!!

[Buildroot] How do I configure the kernel?

[Nicholas Walton]

On Fri, Nov 20, 2009 at 2:23 PM, Grant Edwards
<grant.b.edwards@gmail.com> wrote:
> How do you configure the kernel when using buildroot?

make linux26-menuconfig

Other targets, such as Busybox, follow the same convention.

Nicholas

> I've read through the docs and hunted through the "make
> menuconfig" system, but I can't figure out how to configure the
> kernel.
>
> I'm trying to build an ARM Integrator image by following the
> directions at
>
> http://www.linuxfordevices.com/c/a/Linux-For-Devices-Articles/Getting-started-with-an-embedded-Linux-system-emulator/
>
> But my kernel just locks up solid with absolutely no output.
>
> --
> Grant Edwards ? ? ? ? ? ? ? ? ? grante ? ? ? ? ? ? Yow! I always have fun
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?at ? ? ? ? ? ? ? because I'm out of my
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? visi.com ? ? ? ? ? ?mind!!!

[Buildroot] How do I configure the kernel?

[Grant Edwards]

On 2009-11-20, Nicholas Walton <nwalton@aplopteng.com> wrote:
> On Fri, Nov 20, 2009 at 2:23 PM, Grant Edwards
><grant.b.edwards@gmail.com> wrote:
>> How do you configure the kernel when using buildroot?
>
> make linux26-menuconfig

Doh!  I trield make kernel-menuconfig and several other
variations.  For future reference, is there somewhere that's
documented?

The next question was going to be where do I put a kernel
.config file if I already have one I want to use.  I can
probably do a "find" to search for files named .config and
figure out which is the right one. Then I assume I do "make
linux26-oldconfig"?

> Other targets, such as Busybox, follow the same convention.

Yes, the docs do explain how to configure busybox and uclibc.
I just hadn't guessed the correct "label" for doing the same
thing for the kernel.

-- 
Grant

[Buildroot] How do I configure the kernel?

[Nicholas Walton]

On Fri, Nov 20, 2009 at 9:00 PM, Grant Edwards
<grant.b.edwards@gmail.com> wrote:
> On 2009-11-20, Nicholas Walton <nwalton@aplopteng.com> wrote:
>> On Fri, Nov 20, 2009 at 2:23 PM, Grant Edwards
>><grant.b.edwards@gmail.com> wrote:
>>> How do you configure the kernel when using buildroot?
>>
>> make linux26-menuconfig
>
> Doh! ?I trield make kernel-menuconfig and several other
> variations. ?For future reference, is there somewhere that's
> documented?

I don't recall. I think I found it by bash autocomplete on make.

> The next question was going to be where do I put a kernel
> .config file if I already have one I want to use. ?I can
> probably do a "find" to search for files named .config and
> figure out which is the right one. Then I assume I do "make
> linux26-oldconfig"?

In target/devices/{manufacturer}/{board} as linux-{version}.config, if
I recall correctly. You can automatically create or update the
appropriate file with "make linux26-update". And either menuconfig or
oldconfig will fetch the linux-{version}.config file if
output/build/linux-$version/.config does not exist.

Nicholas

>
>> Other targets, such as Busybox, follow the same convention.
>
> Yes, the docs do explain how to configure busybox and uclibc.
> I just hadn't guessed the correct "label" for doing the same
> thing for the kernel.
>
> --
> Grant

[Buildroot] How do I configure the kernel?

[Peter Korsgaard]

>>>>> "Grant" == Grant Edwards <grant.b.edwards@gmail.com> writes:

Hi,

 Grant> On 2009-11-20, Nicholas Walton <nwalton@aplopteng.com> wrote:
 >> On Fri, Nov 20, 2009 at 2:23 PM, Grant Edwards
 >> <grant.b.edwards@gmail.com> wrote:
 >>> How do you configure the kernel when using buildroot?
 >> 
 >> make linux26-menuconfig

 Grant> Doh!  I trield make kernel-menuconfig and several other
 Grant> variations.  For future reference, is there somewhere that's
 Grant> documented?

Yes, in docs/README:

Depending on your configuration, there are some targets you can use to
use menuconfig of certain packages. This includes:
$ make HOSTCC=gcc-4.3 linux26-menuconfig
$ make HOSTCC=gcc-4.3 uclibc-menuconfig
$ make HOSTCC=gcc-4.3 busybox-menuconfig

We should probably also document it in docs/buildroot.html, I'll fix
that now.

 Grant> The next question was going to be where do I put a kernel
 Grant> .config file if I already have one I want to use.  I can
 Grant> probably do a "find" to search for files named .config and
 Grant> figure out which is the right one. Then I assume I do "make
 Grant> linux26-oldconfig"?

Use the LINUX26_KCONFIG environment variable, similar to
BUSYBOX_CONFIG_FILE / UCLIBC_CONFIG_FILE. I'll also update the doc about
that one.

-- 
Bye, Peter Korsgaard

[Buildroot] How do I configure the kernel?

[Grant Edwards]

On 2009-11-22, Peter Korsgaard <jacmet@uclibc.org> wrote:

> Grant> The next question was going to be where do I put a kernel
> Grant> .config file if I already have one I want to use.  I can
> Grant> probably do a "find" to search for files named .config and
> Grant> figure out which is the right one. Then I assume I do "make
> Grant> linux26-oldconfig"?
>
> Use the LINUX26_KCONFIG environment variable, similar to
> BUSYBOX_CONFIG_FILE / UCLIBC_CONFIG_FILE. I'll also update the doc about
> that one.

Sorry to be so dense, but I still don't get it.  I've got a
.config file I want to use as the starting point for a
"make oldconfig".  I can point LINUX26_KCONFIG at that .config
file, but how do I do the "make oldconfig" step?

-- 
Grant Edwards                   grante             Yow! Here we are in America
                                  at               ... when do we collect
                               visi.com            unemployment?

[Buildroot] How do I configure the kernel?

[Grant Edwards]

On 2009-11-23, Grant Edwards <grant.b.edwards@gmail.com> wrote:
> On 2009-11-22, Peter Korsgaard <jacmet@uclibc.org> wrote:
>
>> Grant> The next question was going to be where do I put a kernel
>> Grant> .config file if I already have one I want to use.  I can
>> Grant> probably do a "find" to search for files named .config and
>> Grant> figure out which is the right one. Then I assume I do "make
>> Grant> linux26-oldconfig"?
>>
>> Use the LINUX26_KCONFIG environment variable, similar to
>> BUSYBOX_CONFIG_FILE / UCLIBC_CONFIG_FILE. I'll also update the doc about
>> that one.
>
> Sorry to be so dense, but I still don't get it.  I've got a
> .config file I want to use as the starting point for a
> "make oldconfig".  I can point LINUX26_KCONFIG at that .config
> file, but how do I do the "make oldconfig" step?

I got a working kernel by

 0) pick the arch, board, target filesystem options, etc.

 1) do a "make" and build everything (including a non-working kernel)

 2) overwrite output/build/linux-2.6.30.2/.config with my old
    but "working" config file.

 3) "make ARCH=arm oldconfig" in the  output/build/linux-2.6.30.2
    directory

That doesn't feel like the proper way to do it, but it seems to
have worked. 

-- 
Grant Edwards                   grante             Yow! Zippy's brain cells
                                  at               are straining to bridge
                               visi.com            synapses ...

[Buildroot] How do I configure the kernel?

[Nicholas Walton]

On Mon, Nov 23, 2009 at 12:01 PM, Grant Edwards
<grant.b.edwards@gmail.com> wrote:
> On 2009-11-23, Grant Edwards <grant.b.edwards@gmail.com> wrote:
>> On 2009-11-22, Peter Korsgaard <jacmet@uclibc.org> wrote:
>>
>>> Grant> The next question was going to be where do I put a kernel
>>> Grant> .config file if I already have one I want to use. ?I can
>>> Grant> probably do a "find" to search for files named .config and
>>> Grant> figure out which is the right one. Then I assume I do "make
>>> Grant> linux26-oldconfig"?
>>>
>>> Use the LINUX26_KCONFIG environment variable, similar to
>>> BUSYBOX_CONFIG_FILE / UCLIBC_CONFIG_FILE. I'll also update the doc about
>>> that one.
>>
>> Sorry to be so dense, but I still don't get it. ?I've got a
>> .config file I want to use as the starting point for a
>> "make oldconfig". ?I can point LINUX26_KCONFIG at that .config
>> file, but how do I do the "make oldconfig" step?
>
> I got a working kernel by
>
> ?0) pick the arch, board, target filesystem options, etc.
> ?1) do a "make" and build everything (including a non-working kernel)
> ?2) overwrite output/build/linux-2.6.30.2/.config with my old
> ? ?but "working" config file.
> ?3) "make ARCH=arm oldconfig" in the ?output/build/linux-2.6.30.2
> ? ?directory
>
> That doesn't feel like the proper way to do it, but it seems to
> have worked

That does work, but a more direct way would be to do the linux
configuration through buildroot.

~/buildroot % make menuconfig
~/buildroot % make linux26-menuconfig
~/buildroot % cp old-linux.config  output/build/linux-$version/.config
~/buildroot % make linux26-$either_config
~/buildroot % make

and finally

~/buildroot % make linux26-update

to copy output/build/linux-$version/.config to
target/device/$whatever/linux-$version.config, which unlike output/ is
not .gitignore'd.

Nicholas

[Buildroot] How do I configure the kernel?

[Grant Edwards]

On 2009-11-23, Nicholas Walton <nwalton@aplopteng.com> wrote:

>> I got a working kernel by
>>
>> ?0) pick the arch, board, target filesystem options, etc.
>> ?1) do a "make" and build everything (including a non-working kernel)
>> ?2) overwrite output/build/linux-2.6.30.2/.config with my old
>> ? ?but "working" config file.
>> ?3) "make ARCH=arm oldconfig" in the ?output/build/linux-2.6.30.2
>> ? ?directory
>>
>> That doesn't feel like the proper way to do it, but it seems to
>> have worked
>
> That does work, but a more direct way would be to do the linux
> configuration through buildroot.
>
> ~/buildroot % make menuconfig
> ~/buildroot % make linux26-menuconfig
> ~/buildroot % cp old-linux.config  output/build/linux-$version/.config
> ~/buildroot % make linux26-$either_config
> ~/buildroot % make

What is $either_config?

> and finally
>
> ~/buildroot % make linux26-update
>
> to copy output/build/linux-$version/.config to
> target/device/$whatever/linux-$version.config, which unlike
> output/ is not .gitignore'd.

OK, thanks.

-- 
Grant Edwards                   grante             Yow! for ARTIFICIAL
                                  at               FLAVORING!!
                               visi.com            

[Buildroot] How do I configure the kernel?

[Nicholas Walton]

On Mon, Nov 23, 2009 at 1:41 PM, Grant Edwards
<grant.b.edwards@gmail.com> wrote:
> On 2009-11-23, Nicholas Walton <nwalton@aplopteng.com> wrote:
>
>>> I got a working kernel by
>>>
>>> ?0) pick the arch, board, target filesystem options, etc.
>>> ?1) do a "make" and build everything (including a non-working kernel)
>>> ?2) overwrite output/build/linux-2.6.30.2/.config with my old
>>> ? ?but "working" config file.
>>> ?3) "make ARCH=arm oldconfig" in the ?output/build/linux-2.6.30.2
>>> ? ?directory
>>>
>>> That doesn't feel like the proper way to do it, but it seems to
>>> have worked
>>
>> That does work, but a more direct way would be to do the linux
>> configuration through buildroot.
>>
>> ~/buildroot % make menuconfig
>> ~/buildroot % make linux26-menuconfig
>> ~/buildroot % cp old-linux.config ?output/build/linux-$version/.config
>> ~/buildroot % make linux26-$either_config
>> ~/buildroot % make
>
> What is $either_config?

menuconfig or oldconfig. Oldconfig will prompt you with new options,
menuconfig assumes you know what you need to change from defaults.

Nicholas

>> and finally
>>
>> ~/buildroot % make linux26-update
>>
>> to copy output/build/linux-$version/.config to
>> target/device/$whatever/linux-$version.config, which unlike
>> output/ is not .gitignore'd.
>
> OK, thanks.

[Buildroot] How do I configure the kernel?

[Grant Edwards]

On 2009-11-23, Nicholas Walton <nwalton@aplopteng.com> wrote:

>>> That does work, but a more direct way would be to do the linux
>>> configuration through buildroot.
>>>
>>> ~/buildroot % make menuconfig
>>> ~/buildroot % make linux26-menuconfig
>>> ~/buildroot % cp old-linux.config ?output/build/linux-$version/.config
>>> ~/buildroot % make linux26-$either_config
>>> ~/buildroot % make
>>
>> What is $either_config?
>
> menuconfig or oldconfig. Oldconfig will prompt you with new
> options, menuconfig assumes you know what you need to change
> from defaults.

While make linux26-menuconfig works, I could never get "make
linux26-oldconfig" to work.  That's why I resorted to the
method I described.

  $ make linux26-oldconfig
  make: *** No rule to make target linux26-oldconfig'.  Stop.

-- 
Grant Edwards                   grante             Yow! Are you selling NYLON
                                  at               OIL WELLS??  If so, we can
                               visi.com            use TWO DOZEN!!