How to install bootable kernel?

[Noone]

Hi,

I tried to build new kernel for my boards but I keep failing in the process.

So far I've done:
- Source from https://github.com/OLIMEX/linux-olimex
- make localmodconfig
- make
- make modules_install
- make install
- reboot (until here everything works)
- Last text line is "Booting kernel ..." and after that nothing. After tens of seconds automatic reboot.

I'm using serial connection. I tried also with HDMI but same thing happened. Image in use is A64-OLinuXino-focal-minimal-20200701-190521.

What I'm missing here?

(I can't find instructions pointed in the post "Can I Put A Custom Kernel on the A64?")

brgs,
-

[LubOlimex]

I feel you missed this post: https://olimex.wordpress.com/2020/04/21/olimage-mainline-linux-images-building-script-for-all-of-our-olinuxino-and-som-boards/

Check the build.sh and run.sh script here:

https://github.com/OLIMEX/olimage

[Noone]

Thanks.

I was able to generate new image easily. I couldn't figure out how to change kernel config though. Is it possible somehow?

I would like to compile extra modules with it.

brgs,
-

[HeHoPMaJIeH]

Hi, you need yo build debian package from sources.
You can use  https://github.com/OLIMEX/linux-olimex/blob/release-20200630-v5.6.14/build-package.sh and install package using dpkg.


~Best

[Noone]

I tried build-package approach and it's almost working. I had to modify DEFCONFIG="linux-sunxi-olinuxino_defconfig" -> DEFCONFIG="olinuxino_defconfig" since linux-sunxi-olinuxino_defconfig was non-existent.


Compiling goes well but there is a problem when creating package:
-----
.
.
.
 fakeroot -u debian/rules binary
make KERNELRELEASE=5.6.14-olimex ARCH=arm       KBUILD_BUILD_VERSION=kaje -f ./Makefile intdeb-pkg
sh ./scripts/package/builddeb
mkdir: cannot create directory '/lib/modules/5.6.14-olimex/': Permission denied
make[4]: *** [scripts/Makefile.package:87: intdeb-pkg] Error 1
make[3]: *** [Makefile:1425: intdeb-pkg] Error 2
make[2]: *** [debian/rules:9: binary-arch] Error 2
dpkg-buildpackage: error: fakeroot -u debian/rules binary subprocess returned exit status 2
make[1]: *** [scripts/Makefile.package:83: bindeb-pkg] Error 2
make: *** [Makefile:1425: bindeb-pkg] Error 2
-----

Obviously I don't want to install crosscompiled package to the amd64 system. Source tree directories are owned by me and with the default permissions. I'm compiling in Ubuntu 20.04.

What now? I'm still lost.

brgs,
-

[kuleszdl]

Well, the problem seems to be that the package.sh script installs this stuff to lib which is okay for a "throwaway-CI" system but not for your production machine. :-) Below is the approach I followed to build kernel packages for kernel 5.8-0-rc5.

Get dependencies:

Code Select Expand

apt install build-essential gcc-aarch64-linux-gnu git unzip

Copy kernel config (looks like you already have one?)
Configure the options you want in your config (e. g. using "make menuconfig", requires a few more libs)

Make sure to set this variable to an empty string (do not uncomment it) in the kernel config file:

Code Select Expand

CONFIG_SYSTEM_TRUSTED_KEYS=""   

Build the debian package (replace "-j16" by the number of available CPU threads):

Code Select Expand

make -j16 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bindeb-pkg

Then, you should get the deb packages from it and can manually install the main one with "dpkg -i" on your target machine.

[kjwiik]

Sorry to revive an old thread but the subject fits to my problem exactly.

I compiled a kernel with make bindeb-pkg according to previous message to add some IIO synth drivers, but it does not boot. There seems to be a loop that flashes eth led periodically. Is the default branch in linux-olimex the correct one (release-20210821-v5.10.60)? The board is a20 olinuxino micro.

Thanks,
Kaj

[kjwiik]

In fact I succeeded in building a bootable kernel after all: the problem was most probably the EHCI boot loop bug. I also noticed a change in the kernel sources and rebuilt the kernel. After that (without any USB device attached) the kernel booted with my modules.

For the record here's my recipe:

Code Select Expand

git clone https://github.com/OLIMEX/linux-olimex.git

cd linux-olimex

scp a20-olinuxino:/boot/config-5.10.47-olimex .config

make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabihf- oldconfig
make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabihf- menuconfig
(add modules and save)

make -j 6 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bindeb-pkg

Cheers,
Kaj