How do I extract the kernel configuration from a kernel image file?
The kernel image file type is:
/boot/kernel7.img: Linux kernel ARM boot executable zImage (little-endian)
The kernel has been compiled with CONFIG_IKCONFIG
enabled. However,
scripts/extract-ikconfig /boot/kernel7.img
returns
extract-ikconfig: Cannot find kernel config.
Note: I am trying the get the config without booting the kernel.
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Answer
If the kernel has been compiled with CONFIG_IKCONFIG=m
(note the m), the configuration in stored in a module (configs.ko
) and not in the kernel itself. That’s the reason why running extract-ikconfig
on the kernel image fails.
In this case, we can extract the config from the configuration module:
/usr/src/$(uname -r)/scripts/extract-ikconfig /lib/modules/$(uname -r)/kernel/kernel/configs.ko