initial arm64 kernel build

Now that we have a basic aarch64 toolchain, it's possible to build Catalin Marinas' aarch64 kernel tree.

This is just a matter of using the alldefconfig target — there are no machine-specific configs in the tree at present. The VGA console code doesn't compile though (we don't have a vga.h header yet), so we need to tweak the config a little before building.

First up, clone Catalin's tree from git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64.git (gitweb view). I'm currently building from commit b6fe1645.

To build, add the path to your toolchain binaries (eg, aarch64-none-linux-gcc) to the PATH variable, and run:

[jk@pecola linux-arm64]$ mkdir obj
[jk@pecola linux-arm64]$ make O=obj ARCH=arm64 CROSS_COMPILE=aarch64-none-linux- alldefconfig
[jk@pecola linux-arm64]$ echo '# CONFIG_VGA_CONSOLE is not set' >> obj/.config
[jk@pecola linux-arm64]$ make O=obj ARCH=arm64 CROSS_COMPILE=aarch64-none-linux- vmlinux

My own builds are at people.canonical.com/~jk/arm64/kernel/2012-08-22. However, they're untested, as there's no hardware available at this stage.

comments

Heron

Hi Jerermy Kerr, How are you recently. I want know the format of TLB entry for armv8, and I'm wondering whether I can find that from the Linux kernel for ARMv8? Cause I had searched that in the source code of the Linux kernel for a long time and failed. Best regards.

posted at 6:15 p.m. on 05 Nov 2012

Heron

Hi Jeremy Kerr, I used the aarch64 toolchain to cross compile the kernel linux-aarch64.git ,but It failed with the error:

root@ubuntu:/home/armv8/linux-aarch64# make O=obj ARCH=arm64 CROSS_COMPILE=aarch64-none-linux- vmlinux
  Using /home/armv8/linux-aarch64 as source for kernel
  GEN     /home/armv8/linux-aarch64/obj/Makefile
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
  UPD     include/generated/utsrelease.h
  CC      arch/arm64/kernel/asm-offsets.s
/home/armv8/linux-aarch64/arch/arm64/kernel/asm-offsets.c:26:26: fatal error: asm/cputable.h: No such file or directory
 #include <asm/cputable.h>
                      ^
compilation terminated.
make[2]: *** [arch/arm64/kernel/asm-offsets.s] Error 1
make[1]: *** [prepare0] Error 2
make: *** [sub-make] Error 2

Then I 'find / -name cputable.h' and can not find the cputable.h for aarch64:

root@ubuntu:/home/armv8/linux-aarch64/arch/arm64/kernel# find / -name cputable.h
/usr/src/linux-headers-3.2.0-23/arch/microblaze/include/asm/cputable.h
/usr/src/linux-headers-3.2.0-23/arch/powerpc/include/asm/cputable.h
/home/armv8/linux-aarch64/arch/microblaze/include/asm/cputable.h
/home/armv8/linux-aarch64/arch/powerpc/include/asm/cputable.h

How to solve this problem? Thanks in advance.

posted at 12:28 p.m. on 18 Oct 2012

Jeremy Kerr

Hi Heron,

There may be a difference in the sources that you're trying to build. Are you sure you're building from commit b6fe1645?

Try resetting your tree to that commit, and see if that works:

git reset --hard b6fe1645

Regards,

Jeremy

posted at 12:38 p.m. on 18 Oct 2012

Heron

Hi Jeremy Kerr, Thanks for your timely reply,'git reset --hard b6fe1645' it works! Thanks again.

posted at 7:07 p.m. on 18 Oct 2012

initial arm64 kernel build

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