Enabling THUMB2 kernel config option

[S, Venkatraman]

You should use the "config" script inside the scripts directory in the Kernel.
Example: (in the kernel root directory)
make ARCH=arm CROSS_COMPILE=arm- omap2plus_defconfig
scripts/config --enable CONFIG_THUMB2_KERNEL

Regards,
Venkat.

On Thu, Oct 20, 2011 at 6:43 PM, Deepti Kalakeri
<deepti.kalakeri at linaro.org> wrote:
> Hello All,
>
> I have a need to enable thumb2 kernel option for kernel built using
> omap2plus_defconfig.
> Hence I am trying to find a mechanism to automatically enable the thumb2
> kernel config option.
> I have tried adding the CONFIG_THUMB2_KERNEL=y option to the .config file by
>
> 1) Appending it to the end of the .config using the echo
> CONFIG_THUMB2_KERNEL=y >> output_dir/.config
> 2) By replacing the CONFIG_ARM_THUMB=y with CONFIG_THUMB2_KERNEL=y  option
> using the sed -ie 's/CONFIG_ARM_THUMB=y/CONFIG_THUMB2_KERNEL=y/g'
> output_dir/.config
>
> I follow this with the make oldconfig for ex:
>
> yes "" | make ARCH=arm O=output_dir
> KERNELVERSION=3.0.5-758-g051c523-omap2plus-linaro-omap
> KERNELRELEASE=3.0.5-758-g051c523-omap2plus-linaro-omap
> CROSS_COMPILE=arm-linux-gnueabi- oldconfig
>
> Both the above mechanisms work, but once I run oldconfig the .config is
> getting overwritten and it gets back to the old state.
>
> I am sure there is something which I am missing. Can you let me know the
> exact steps to overwrite the .config file.
>
> 1) I want to be able to overwrite the THUMB option with THUMB2 or add the
> THUMB2 option ( if existence of both THUMB and THUMB2 in the .config is
> permissible)
> 2) What would happen if both the CONFIG_ARM_THUMB=y and
> CONFIG_THUMB2_KERNEL=y options are present in the .config.
>     Would the kernel be built with CONFIG_ARM_THUMB=y or
> CONFIG_THUMB2_KERNEL=y  ?
>
> Do you have any suggestions to enable the THUMB2 option in a non-interactive
> way ?
>
> --
> Thanks and Regards,
> Deepti
> Infrastructure Team Member, Linaro Platform Teams
> Linaro.org | Open source software for ARM SoCs
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