how to re-configure kernel for imx devices

[yanfengliu]

Hi,

I am using FSL Linux 3.10.17 with iMX6Q device and can successfully build the SD image and boot the device.

Then I tried to reconfigure Linux kernel.

I did the following steps:

1. use "bitbake -c menuconfig linux-imx" tool and save the altered configuration.
2. use "bitbake -c deploy linux-imx" to rebuild the kernel after saving the configuration in last step.

However, nothing seems happened.

Can someone help to share what are the steps needed for re-configure and re-build the kernel binaries?

Regards,

yf

[alejandrolozan1 · Accepted solution]

Hi,

Have you checke this?

Task #5 - Kernel

Best Regards,

Alejandro

[yanfengliu]

Alejandro,

Thank you for the pointer, I checked the URL and tried to identify the proper "defconfig" under "sources/meta-fsl-arm" folder and got:

meta-fsl-arm/recipes-kernel/linux/linux-timesys-3.0.15/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-3.10.9/mx6/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-2.6.35.3/imx28evk/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-2.6.35.3/mx5/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-2.6.35.3/imx23evk/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-3.0.35/mx6q/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-3.0.35/mx6dl/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-3.0.35/mx6sl/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-imx-3.0.35/mx6s/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-fslc/mxs/defconfig

meta-fsl-arm/recipes-kernel/linux/linux-fslc/defconfig

I am not sure which is the one for 3.10.17 version kernel on imx6q device? None of these defconfig files look like the one in build folder

520fc9c85e261a9959853268ecbe3d28  linux-imx/3.10.17-r0/defconfig

520fc9c85e261a9959853268ecbe3d28  linux-imx/3.10.17-r0/git/arch/arm/configs/imx_v7_defconfig

Does this mean that 3.10.17 version is not using any "defconfig" under "sources" folder?

Regards,

yanfeng

[LuisCasado]

Hello,

Kernel 3.10.17 uses ‘device tree' and imx_v7_defconfig.

Luis

[yanfengliu]

Luis,

So this means for 3.10.17, we can simply do:

1) bitbake -c cleansstate linux_imx

2) bitbake -c menuconfig linux_imx to config the kernel and save result upon exit

3) bitbake -c deploy linux_imx to build kernel w/ new config updated in step #2

Is this what you mean?

There is no "defconfig" thing to touch in "sources/" folder, right?

Regards,

yanfeng

[LuisCasado]

Hello,

No, you only have to follow the Task 5 document. You can use menuconfig to modify configuration.

If wanted to build manually the kernel, for development for example in a separated folder, starting from default config, you could do:

export PATH=$PATH:/home/yocto/fsl-yocto-bsp/imx6q_image_test/tmp/sysroots/i686-linux/usr/bin/cortexa9hf-vfp-neon-poky-linux-gnueabi

make -j4 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- imx_v7_defconfig

(If you need change something) make -j 4 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- menuconfig

(If need clean) make -j4 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- mrproper

make -j4 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- LOADADDR=10008000 uImage

make -j4 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- modules

make -j4 ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- INSTALL_MOD_PATH=<PATH to rootfs> modules_install   

Regards,

Luis