Not working scripts for native compiling kernel modules

[pmelikov]

Describe the bug
The fixdep command as provided in the armhf header file is a x86-64 version which cannot run on armhf and arm64. This break native compilation of kernel modules. I am compiled my own kernel end headers with preemt-rt patch. Used

root@raspberrypi:/home/pi/Desktop/LEDG0_timer# file /usr/src/$(uname -r)/scripts/basic/fixdep
/usr/src/5.10.13-rt26-preemt_rt-v7+/scripts/basic/fixdep: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=fc5b93fa068bb02ca6fa1f1e2eeb99fa74a19c84, for GNU/Linux 3.2.0, not stripped

CROSS COMPILE HOST: Linux VirtualBox 5.8.0-41-generic #46~20.04.1-Ubuntu SMP Mon Jan 18 17:52:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
DEVICE: Pi3B+

I tryed to compile end test 4 different options :

• kernel 5.4 and 5.10 with this parameters + rt_preemt patch:

export KERNEL=kernel8
export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-
export BIT_32=false
make -j$((`nproc`*2)) bcmrpi3_defconfig
make -j$((`nproc`*2))

• kernel 5.4 and 5.10 with this parameters + rt_preemt patch:

export KERNEL=kernel7
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-
export BIT_32=true
make -j$((`nproc`*2)) bcm2709_defconfig
make -j$((`nproc`*2))

Two of 4 tested configs:
kernel 5.10.13-rt26-v7+ with rt-preemt patch 5.10.12-rt26
kernel 5.4.83-v8+ with rt-preemt patch 5.4.84-rt47

As base SD image i used this and just put my headers, modules, dts and kernel into it:

• 2021-01-11-raspios-buster-armhf.zip
• 2020-08-20-raspios-buster-arm64.zip

env PATH=$PATH make -j$((`nproc`*2)) INSTALL_MOD_PATH=../mnt/ext4 modules_install
env PATH=$PATH make -j$((`nproc`*2)) INSTALL_HDR_PATH=../mnt/ext4 headers_instal
#for armhf 
mv ../mnt/fat32/kernel.img ../mnt/fat32/kernel-backup.img
cp arch/arm/boot/zImage ../mnt/fat32/kernel.img
cp arch/arm/boot/dts/*.dtb ../mnt/fat32/
cp arch/arm/boot/dts/overlays/*.dtb* ../mnt/fat32/overlays/
cp arch/arm/boot/dts/overlays/README ../mnt/fat32/overlays/

release="$(cat ./include/config/kernel.release)" #in linux dir
cp -R linux ./mnt/ext4/usr/src/
mv -R ./mnt/ext4/usr/src/linux ./mnt/ext4/usr/src/"$release" #rename sources
cd ./mnt/ext4/
ln -sr ./usr/src/"$release" ./lib/modules/"$release"/build

Error when trying to compile "hello world" kernel module:

root@raspberrypi:/home/pi/Desktop/LEDG0_timer# make
make -C /lib/modules/5.10.13-rt26-preemt_rt-v7+/build M=/home/pi/Desktop/LEDG0_timer modules
make[1]: Entering directory '/usr/src/5.10.13-rt26-preemt_rt-v7+'
  CC [M]  /home/pi/Desktop/LEDG0_timer/LEDG0_timer.o
/bin/sh: 1: scripts/basic/fixdep: Exec format error
make[2]: *** [scripts/Makefile.build:279: /home/pi/Desktop/LEDG0_timer/LEDG0_timer.o] Error 2
make[2]: *** Deleting file '/home/pi/Desktop/LEDG0_timer/LEDG0_timer.o'
make[1]: *** [Makefile:1808: /home/pi/Desktop/LEDG0_timer] Error 2
make[1]: Leaving directory '/usr/src/5.10.13-rt26-preemt_rt-v7+'
make: *** [Makefile:4: all] Error 2

[pmelikov]

Tryed this: https://forum.loverpi.com/discussion/555/how-to-fix-dkms-error-bin-sh-1-scripts-basic-fixdep-exec-format-error
But it didnt help. Same error.

[pyavitz]

Cross Compiling
Simply applying the byteshift patch and running make scripts doesn't always work, I recommend trying the following.

make M=scripts clean
patch -p1 < headers-byteshift.patch
echo 'y' | make -s scripts
echo 'y' | make -s M=scripts/mod/

[pyavitz]

I originally got the patch from Armbian, but I don't believe they created it and there is no official patch for the Pi. https://github.com/raw/pyavitz/rpi-img-builder/master/patches/headers-byteshift.patch I created packaging patches for kernel builds and included it in the build process. You can review the patches here: https://github.com/pyavitz/rpi-img-builder/tree/master/patches/cc

[pmelikov]

Cross Compiling

Simply applying the byteshift patch and running make scripts doesn't always work, I recommend trying the following.

make M=scripts clean

patch -p1 < headers-byteshift.patch

echo 'y' | make -s scripts

echo 'y' | make -s M=scripts/mod/

Thanks a lot, my friend. Armbian patch and making of "scripts" and "scripts/mod" solved the problem. All the best to you🙋‍♂️. Ok, later I will research your repo🤓.