I would like to add some LOG to procd.c because I need some message to understand boot process. If I modify build_dir/target/procd/procd.c and make it. It can be vanish. Can I use "$ make target/procd/{clean,prepare} V=s QUILT=1" ? How can I do? Thank you!
I add a patch by quilt but when I use " make target/linux/update package/index V=s" get error. Dose my patch add in build_dir/target*/procd/ is correct?
No, it's not - the link explains exactly how to deal with it though (https://openwrt.org/docs/guide-developer/toolchain/use-patches-with-buildsystem#refreshing_patches).