Include prune.config to reduce kernel Image size #1245
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vkraleti
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koenkooi
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lumag
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…figs
Currently, CONFIG_LIST lists both in-tree kernel config fragments as well as
external *.cfg files provided via SRC_URI. Mixing these makes it harder to
control which fragments are applied internally versus externally.
Introduce a new variable, KBUILD_CONFIG_EXTRA, aligned with Kbuild naming
conventions to handle internal kernel configuration fragments such as
hardening.config. External fragments remain controlled through SRC_URI,
so no separate list is needed for those.
The do_configure step now merges:
- Base defconfig from arch/${ARCH}/configs
- External fragments from find_cfgs(d)
- In-tree fragments from KBUILD_CONFIG_EXTRA
Signed-off-by: Viswanath Kraleti <[email protected]>
Added prune.config to KBUILD_CONFIG_EXTRA for aarch64 builds. This disables configurations for non-target architectures, significantly reducing kernel size: Image size: 39.5 MB → 25.7 MB vmlinux size: 150 MB → 106 MB Signed-off-by: Viswanath Kraleti <[email protected]>
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lumag
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ricardosalveti
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Added prune.config to KBUILD_CONFIG_EXTRA for aarch64 builds to
disable non-target architectures configurations, thus significantly reducing kernel size.