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 ?
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Thanks and Regards,
Deepti
Infrastructure Team Member, Linaro Platform Teams
Linaro.org | Open source software for ARM SoCs