Buildroot linux kernel clean build

Question

I am using buildroot to build linux firmware. How can I do a clean rebuild the linux kernel only (without having to build the whole thing which take an hour)?

I tried -

make linux-rebuild

but that does not do a clean.

I have also tried

make linux-reconfigure && make linux-rebuild

but that does not work either.

Please edit your post and include the messages/errors you have after those commands. — user2699113, May 18 '18 at 03:39
I usually `cd` to the kernel directory, then `make ARCH= clean`, and delete the *salient* **.stamp*** files, e.g. **.stamp_build**. Be careful to not delete all of them. — sawdust, May 21 '18 at 06:49

score 14 · Answer 1 · edited Jan 11 '23 at 15:35

14

If you want to remove all of the changes in sources of the linux kernel be in buildroot directory (cd buildroot) and do following:

make linux-dirclean
make linux-rebuild

The first command will remove output/build/linux* directory and the second one will fetch and rebuild from scratch the kernel.

edited Jan 11 '23 at 15:35

DungeonLords

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answered May 18 '18 at 03:53

user2699113

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Thanks for your answer , and good to know about -dirclean. but this is I was wanting to do , I was looking for a clean rebuild behaviour. – NiladriBose May 18 '18 at 08:39
@NiladriBose how is the clean behaviour not clean with `linux-dirclean`? What do you observe? – Ciro Santilli OurBigBook.com Sep 08 '18 at 03:37
1

just a note - if download cache is enabled in BR, you'll need to delete linux.tar distro there – Mixaz Mar 04 '20 at 23:26

score -1 · Answer 2 · answered Feb 08 '19 at 20:32

-1

I've found in the buildroot /dl folder a copy of the kernel repo is stored in there as a tar.gz file. If you do not delete that file, buildroot will not pull any kernel updates.

answered Feb 08 '19 at 20:32

Adam

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score -3 · Answer 3 · answered May 18 '18 at 08:41

-3

after reading a lot through buildroot manual and trail and error - this is what you need to do for cleaning of linux only -

make clean linux

answered May 18 '18 at 08:41

NiladriBose

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"make clean linux" will clean the entire build, not just Linux, so this answer is wrong. – Thomas Petazzoni May 18 '18 at 09:46
wrong , atleast for 2016.02 for cleaning entire build i had to do - make clean all. Make clean linux rebuilds linux-custom. – NiladriBose May 18 '18 at 12:48
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Hmm, Thomas is a maintainer of BR distribution. I think he knows what he is talking about. – 0andriy May 20 '18 at 18:12
Ok , what is the difference between make clean linux and make clean all? or in other words what is the purpose of make clean linux or make clean – NiladriBose May 21 '18 at 11:57
Or why on earth will make clean clean the entire build !! lol – NiladriBose May 21 '18 at 12:04
2

@NiladriBose Why `make clean linux` cleans the entire build? Because that's how `make` works: `make clean linux` will basically run `make clean` followed by `make linux`. It's not "Hey *make*, please clean the linux package" but: "*make*, please run the `clean` target and then run the `linux` target". – Stephan Henningsen Nov 08 '20 at 22:05

Buildroot linux kernel clean build

3 Answers3