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.config not getting updated after modification to tegra3_android_defconfig After adding a module(MODULE_XX_CONFIG=y) inside tegra3_android_defconfig, I did "make tegra3_android_defconfig" though the build is successful, the generated .config doesn't have the newly added entry.

aTJ
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2 Answers2

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Caution :: This answer is for standard Linux kernel. I'm not sure about android-kernel.

Adding configuration flag only to tegra3_android_defconfig is not enough. Same configuration should be included in Kconfig file also.

When defconfig is done, .config will be generated based on Kconfig files. Only value for that particular configuration is taken from arch/XX/configs/XX_defconfig.

If value for particular configuration is not mentioned in XX_defconfig, then the default value mentioned in Kconfig will be used and the .config file will be generated.

Consider CONFIG_IPV6 flag in tegra_defconfig of standard kernel.

The following file is responsible for that configuration.
http://lxr.free-electrons.com/source/net/ipv6/Kconfig

IPV6                ---> CONFIG_IPV6 
IPV6_OPTIMISTIC_DAD ---> CONFIG_IPV6_OPTIMISTIC_DAD
IPV6_ROUTER_PREF    ---> CONFIG_IPV6_ROUTER_PREF
Jeyaram
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    My Kconfig is proper but I forgot to add ---> source "drivers/xxx/Kconfig" inside the root Kconfig file to allow the build to use my Kconfig. – aTJ Aug 21 '15 at 06:35
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    Thanks for replying ! – aTJ Aug 21 '15 at 06:35
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Found out the issue finally. Have to add our Kconfig path to the root Kconfig file. Like ---> source "drivers/xxx/Kconfig" in the root Kconfig file so that it allows the build to use the new driver Kconfig file.

aTJ
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