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krotuss
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Joined: 01 Aug 2008
Posts: 246
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 Posted: Wed Oct 16, 2024 11:13 am Post subject: customizing genkernel/installkernel |
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Hi,
would it be possible to modify genkernel and installkernel to automate kernel build and install on architecture that is not supported out of the box? For example raspberry raspberry pi. I am interested in automating process described here here. Where it differs most from standard install is that there is extra make 'dtbs' target, and need to copy those dtb files to correct /boot location, rpi also uses different kernel image by default.
I expect that it should be possible and relatively easy, for somebody who knows what he's doing, but I didn't found it in any gentoo rpi guide. I have very little experience with those two packages, so I would be grateful for any advice about how to do it efficiently. |
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Nowa
Developer
Joined: 25 Jun 2014
Posts: 444
Location: Nijmegen
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| Posted: Wed Oct 16, 2024 12:12 pm Post subject: |
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installkernel is mostly modular and can be customized to do basically anything using plugins. But genkernel does not use installkernel, it has its own kernel installation mechanism.
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pingtoo
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Joined: 10 Sep 2021
Posts: 1322
Location: Richmond Hill, Canada
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| Posted: Wed Oct 16, 2024 1:58 pm Post subject: Re: customizing genkernel/installkernel |
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| krotuss wrote: | Hi,
would it be possible to modify genkernel and installkernel to automate kernel build and install on architecture that is not supported out of the box? For example raspberry raspberry pi. I am interested in automating process described here here. Where it differs most from standard install is that there is extra make 'dtbs' target, and need to copy those dtb files to correct /boot location, rpi also uses different kernel image by default.
I expect that it should be possible and relatively easy, for somebody who knows what he's doing, but I didn't found it in any gentoo rpi guide. I have very little experience with those two packages, so I would be grateful for any advice about how to do it efficiently. |
Can't say for other arch. but for rpi, the current genkernel and installkernel will require major change in order accommodate rpi specific need.
for example if using source code, the mainline linux source code may be able to use but it is incomplete. so use RasberryPi released source in Gentoo mean it must be sys-kernel/raspberrypi-source which have slyly different naming so need changes in genkernel configuration and the build result store in different location and naming require more changes.
installkernel does not look at raspberrypi-source build result so it will need to know the build process is for rpi in order to know where to look for build result.
and the install destination can change so the automate install procedure need to accommodate changes outside of control.
all and all it is not as easy as you described.
However I believe the "installkernel" is the name that make call when told to install kernel, so you can write a version of your own to target rpi specific. |
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krotuss
Apprentice
Joined: 01 Aug 2008
Posts: 246
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| Posted: Thu Oct 17, 2024 6:30 pm Post subject: Re: customizing genkernel/installkernel |
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| pingtoo wrote: |
for example if using source code, the mainline linux source code may be able to use but it is incomplete. so use RasberryPi released source in Gentoo mean it must be sys-kernel/raspberrypi-source which have slyly different naming so need changes in genkernel configuration and the build result store in different location and naming require more changes.
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I was able to successfully build raspberry kernel using genkernel just by adding --makeopts=dtbs, of course, then I had to manually copy dtb files to boot. Maybe this could be automated by simple postinst script, I am not sure if genkernel supports that. |
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