On Thu, Oct 20, 2011 at 11:30 PM, Amit Kucheria amit.kucheria@linaro.orgwrote:
On 11 Oct 20, Deepti Kalakeri 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
- 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.
You can't just enable THUMB2 when other config options that prevent THUMB2 (such as CPU_V6) are enabled.
I tried this with the make omap2plus_defconfig, followed by make menuconfig to do interactive selection of THUMB2. For this, I first had to disable CPU_V6 (by disabling OMAP2 support), for the THUMB2 to be selectable.
The diff between the resulting .config and omap2plus_defconfig is at http://paste.ubuntu.com/714378/
See below on how to achieve this non-interactively.
I am sure there is something which I am missing. Can you let me know the exact steps to overwrite the .config file.
- 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 ?
Try the following:
make ARCH=arm omap2plus_defconfig yes "" | make ARCH=arm oldconfig cp .config /tmp/config echo "CONFIG_ARCH_OMAP2=n" >> .config echo "CONFIG_THUMB2_KERNEL=y" >> .config yes "" | make ARCH=arm oldconfig grep THUMB2 .config
Thanks Amit. These steps worked for me.
/Amit