i.MX ProcessorsのトピックRe: Kernel config file used by Yocto

Kernel config file used by Yocto

dhavalvadhar — Fri, 31 Jul 2015 06:30:00 GMT

Hello,

I able to configure the Ubuntu machine and build the images using Yocto. But now I would like to modify the kernel configuration and build the kernel with that configuration. I read somewhere that Yocto uses the kernel configuration file "<build_dir>/../sources/meta-fsl-arm/recipes-kernel/linux/linux-imx-3.10.17/mx6/defconfig". But the linux kernel version is 3.14.28. Then how come the Yocto build uses the configuration file of linux kernel v3.10.17.

Please help me to understand this.

Appreciate your quick reply.

Thanks,

Dhaval

Re: Kernel config file used by Yocto

saurabh206 — Fri, 31 Jul 2015 08:31:22 GMT

Dhaval

You can select imx-3.14.28-1.0.0_ga

repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.28-1.0.0_ga

Or you can use the

PREFERRED_VERSION_linux-imx_mx6 = "3.14.28"

Re: Kernel config file used by Yocto

dhavalvadhar — Fri, 31 Jul 2015 10:41:48 GMT

Hi Saurabh,

Thanks for your quick reply!

Actually, I followed the Freescake Yocto Project User's Guide available in the documentation of "fsl-yocto-3.14.28-1.0.0". I sync the repo mentioned in that document. Now as you mentioned to sync with different repo. Then do I need to remove the old repo? It would be really great if you can elaborate the options you have suggested.

I want to know how to build the kernel again after changing it's configuration using Yocto.

Thanks,

Dhaval

Re: Kernel config file used by Yocto

dhavalvadhar — Mon, 03 Aug 2015 10:51:02 GMT

Hi,

Can someone please help me here?

Thanks,

Dhaval

Re: Kernel config file used by Yocto

gusarambula — Mon, 03 Aug 2015 21:00:43 GMT

Hello Dhaval Vadhar,

Would you please confirm which repo were you using?

In case you switch repo you should just change the repo and run a sync. However, I would recommend using a new directory in case you will jump to a new kernel version.

There is a simple buy good document on how to change the kernel configuration on the following link, perhaps it will help.

Yocto Training - Task #5

Re: Kernel config file used by Yocto

dhavalvadhar — Tue, 04 Aug 2015 08:55:22 GMT

Hi,

Thanks for your help!

As I said before, I was following Freescale Yocto Project User's Guide from 'fsl-yocto-3.14.28-1.0.0' documentation. Thus I have used following command to sync with the repo:

$ repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.28-1.0.0_ga

$ repo sync

I also read the Yocto Training Task #5. According to that to change the kernel configuration I need to replace the 'defconfig' file from "meta-fsl-arm/receipes-kernel/linux/linux-imx-<kernel version>/mx6". Now in my case, the 'kernel version' should be '3.14.28', but that directory doesn't exist. Instead directory 'linux-imx-3.10.17/mx6' is exist.

Thus I am getting little confused, how to change the kernel configuration and then built it using 'bitbake linux-imx' command. Please help me for the same.

Appreciate your quick reply!

Thanks,

Dhaval

Re: Kernel config file used by Yocto

saurabh206 — Tue, 04 Aug 2015 09:36:58 GMT

Dhaval

Please use following in local.conf to build 3.14.28 kernel.

PREFERRED_VERSION_linux-imx_mx6 = "3.14.28"

Thanks

Saurabh

Re: Kernel config file used by Yocto

dhavalvadhar — Tue, 04 Aug 2015 11:59:14 GMT

Hi Saurabh,

Thanks for quick response!

I am able to build the linux kernel using 'bitbake linux-imx' command. But my question is how to build the kernel after changing the configuration?

Thanks,

Dhaval

Re: Kernel config file used by Yocto

saurabh206 — Tue, 04 Aug 2015 12:13:58 GMT

Dhaval

Please go through the attached Yocto tutorial.

Re: Kernel config file used by Yocto

dhavalvadhar — Wed, 05 Aug 2015 07:38:11 GMT

Hi Saurabh,

Thanks once again for your reply!

That tutorial was really good. But it hasn't answered my question.

Thanks,

Dhaval

Re: Kernel config file used by Yocto

BiyongSUN — Thu, 06 Aug 2015 05:41:28 GMT

bitbake linux-imx -c menuconfig

linux-imx_3.14.28.bb

do_configure_prepend() {

# copy latest defconfig for imx_v7_defconfig to use

cp ${S}/arch/arm/configs/imx_v7_defconfig ${S}/.config

cp ${S}/arch/arm/configs/imx_v7_defconfig ${S}/../defconfig

}

Re: Kernel config file used by Yocto

dhavalvadhar — Thu, 06 Aug 2015 10:54:56 GMT

Hi Biyong,

Thanks for your reply!

As you suggested, I need to add the do_configure_prepend() function in linux-imx_3.14.28.bb file. But that file is not exist.

So do I need to create it? If yes, what else I need to add into that file?

Thanks,

Dhaval

Re: Kernel config file used by Yocto

BiyongSUN — Fri, 07 Aug 2015 03:23:33 GMT

linux-imx_3.14.28.bb is just take 3.14.28 release as example.

What is your BSP version?

Like 3.10.53, you can find

fsl-release-bsp/sources/meta-fsl-bsp-release/imx/meta-fsl-arm/recipes-kernel/linux/linux-imx_3.10.53.bb

Re: Kernel config file used by Yocto

dhavalvadhar — Fri, 07 Aug 2015 05:26:38 GMT

BSP Version is : 3.14.28

But the sources directory, sources/meta-fsl-arm/recipes-kernel/linux, doesn't have any directory/.bb file for linux version 3.14.28. Instead it has directory and .bb file for 3.10.17.

So do I need to create the .bb file for 3.14.28 manually?

Re: Kernel config file used by Yocto

BiyongSUN — Fri, 07 Aug 2015 05:46:02 GMT

ls fsl-release-bsp/sources/meta-fsl-bsp-release/imx/meta-fsl-arm/recipes-kernel/linux/

linux-imx_3.14.28.bb linux-imx_%.bbappend linux-imx-mfgtool_3.14.28.bb

Re: Kernel config file used by Yocto

dhavalvadhar — Fri, 07 Aug 2015 07:31:26 GMT

Thanks Biyong for your quick response!

I ran 'bitbake linux-imx -c menuconfig' command. And thus .bb file of linux kernel version 3.14.28, it will first run the do_configure_prepend() function before starting configuration. So it will copy the 'imx_v7_defconfig' to '.config' and 'defconfig' files.

1. What is the need of copying imx_v7_defconfig to those files?

2. How did the bitbake command use the .bb file of 3.14.28 linux kernel and not of 3.10.17 linux kernel?

Re: Kernel config file used by Yocto

BiyongSUN — Fri, 07 Aug 2015 08:49:38 GMT

For how to use the yocto, please refer to the yocto official site.

And 3.10.17 and 3.14.28 use the different way to handle the linux config file. It depends on the designer.

In the 3.14.28, it copy the default config file to .config. cheat the linux. it has run the make <default config> already.

you can add you owner recipe for your owner favorite way.

Re: Kernel config file used by Yocto

dhavalvadhar — Fri, 07 Aug 2015 08:54:31 GMT

Ok.. Thanks Biyong.

Re: Kernel config file used by Yocto

chrishossack — Thu, 17 Sep 2015 15:59:16 GMT

Hi,

I'm having the same problem. Could you sum up what commands you ran to change the kernel and then rebuild it please.

cheers

Chris

Re: Kernel config file used by Yocto

khangbui — Mon, 28 Sep 2015 21:31:03 GMT

Hi,

I'm also having the same problems... would love a resolution on this issue.