Cross compile aarch64 kenerl for rpi3 on arch linux host

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Cross compile aarch64 kenerl for rpi3 on arch linux host

Postby LPFaile » Mon Sep 04, 2017 4:51 pm

Hi,

I try to compile the kernel sources of aarch64 for rpi 3. I want to modify the kerenl sources to include a new system call. For raspbian i just find the kernel source and use a crosscompile toolchain on my X86 with ubuntu.
For Arch pi 3 i can not find the kernel sources. I found this https://archlinuxarm.org/packages/aarch64/linux-aarch64 and https://archlinuxarm.org/packages/aarch … 64-headers. I try to compile by using a ready toolchain for armv8 that i find here https://archlinuxarm.org/wiki/Distcc_Cross-Compiling. I just run at kernel source make ARCH=arm64 CROSS_COMPILE=/path to my crosscompile/ clean. some errors related with missing of folders are cachieved.
Someone can guide me on this?
I have see at this forum subject viewtopic.php?f=65&t=11690 that someone infront the problem by modify the configuration at PKGBUIL, but i think this is not enough for me because I need to modify the kernel sources before of compile it.

Thanksss
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Re: Cross compile aarch64 kenerl for rpi3 on arch linux host

Postby graysky » Mon Sep 04, 2017 6:02 pm

graysky wrote:To my knowledge you cannot compile armv7h or aarch64 on x86_64 native. You can use distcc and the correct toolchain and initiate the compile on the ARM device using the x86_64 host as a slave. I do this all the time.

https://archlinuxarm.org/wiki/Distcc_Cross-Compiling
https://wiki.archlinux.org/index.php/Distcc
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Re: Cross compile aarch64 kenerl for rpi3 on arch linux host

Postby LPFaile » Wed Sep 06, 2017 5:27 pm

My error was:

HOSTCC scripts/basic/bin2c
HOSTCC scripts/kconfig/conf.o
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --silentoldconfig Kconfig
drivers/ras/Kconfig:33: can't open file "arch/x86/ras/Kconfig"
make[3]: *** [scripts/kconfig/Makefile:39: silentoldconfig] Error 1
make[2]: *** [Makefile:547: silentoldconfig] Error 2
scripts/Makefile.clean:14: arch/arm64/crypto/Makefile: No such file or directory
make[1]: *** No rule to make target 'arch/arm64/crypto/Makefile'. Stop.
make: *** [Makefile:1307: _clean_arch/arm64/crypto] Error 2


Note that the same error i achieved if i compile the packadge from https://archlinuxarm.org/packages/aarch ... 64-headers on X86 using a croos compile and also directly on Raspberry. What i think is that this packadge does not containe the kernel source, contain a patch to add to the base kernel. I think this because does not exist a folder arch/arm64/crypto/Makefile that exist at the v4.x kernel.
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Re: Cross compile aarch64 kenerl for rpi3 on arch linux host

Postby sirspudd » Fri Sep 08, 2017 4:33 am

Top of the morning,

I actually cover this (on fedora, but I duplicated the effort for Arch, just grab the source) at the foot of:

http://www.chaos-reins.com/2016-08-20-q ... a-aarch64/

namely:

dnf download –source kernel-main (on Fedora image)
Copy this to a build machine
Extracted the rpm (using rpmextract.sh on Arch)
Unpacked the source
Copied the standing config from /proc/config.gz to .config
make ARCH=arm CROSS_COMPILE=/opt/arm-sirspuddarch-linux-gnueabihf/bin/arm-sirspuddarch-linux-gnueabihf- bcm2835_defconfig
make ARCH=arm64 CROSS_COMPILE=/opt/aarch64-rpi3-linux-gnueabi/bin/aarch64-rpi3-linux-gnueabi- menuconfig
Disabled CONFIG_ARM64_VA_BITS_48 and adjust kernel as necessary
make ARCH=arm64 CROSS_COMPILE=/opt/aarch64-rpi3-linux-gnueabi/bin/aarch64-rpi3-linux-gnueabi-
INSTALL_MOD_PATH=foobar make ARCH=arm64 CROSS_COMPILE=/opt/aarch64-rpi3-linux-gnueabi/bin/aarch64-rpi3-linux-gnueabi- modules_install
Copy across the module directory indicated above, and the generated kernel ./arch/arm64/boot/Image (aarch64 requires this new Image format which contains ARM64 magic)
Update extlinux.conf
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