real time kernel on pi?

[novitsky]

Hi,
Does anyone have an experience with a real-time kernel on pi? any assistant would be great.
kind regards,
Ran

[moonman]

You can try to compile one yourself

Patch: https://www.kernel.org/pub/linux/kernel ... 6.patch.gz
(There are none for 3.9 if you wanted it with linux-raspberrypi-latest)

PKGBUILD: https://github.com/archlinuxarm/PKGBUIL ... aspberrypi

[novitsky]

Thank you very much moonman. However, my knowledge with compiling a Linux kernel is Null. Can you please give me some directions? A link to a guide or pointers on how to use the PKGBUILD and patch would be appreciated.

kind regards,
Ran

[moonman]

http://archlinuxarm.org/developers/building-packages

Download all files from git
$this->bbcode_second_pass_code('', 'git clone https://github.com/archlinuxarm/PKGBUILDs.git')

cd PKGBUILDs/core/linux-raspberrypi/

EDIT PKGBUILD to include the patch into the source array, then add a line patch -Np1 <patch>

compile with makepkg --asroot (or without that flag if you are not root)

[novitsky]

Wow, Thanks for the quick reply. I'll try that. Should I do it on the raspberrypi itself or can I do it on a normal (X86) machine?
Kind regards,
Ran

[moonman]

You have to compile on the pi, but you can speed up the process by distributing some compile jobs to your x86 machines from the pi (with linking and scripting still being done on the pi): http://archlinuxarm.org/developers/dist ... -compiling.

[novitsky]

Once again, Thanks.
I updated the PKGBUILD and copied the files to the SD card.
I run the command:
makepkg --asroot -Acs
but I get this error:
$this->bbcode_second_pass_code('', '==> Making package: linux-raspberrypi 3.6.11-11 (Mon Jun 3 11:14:58 BST 2013)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Installing missing dependencies...
resolving dependencies...
looking for inter-conflicts...

Packages (3): perl-test-pod-1.48-1 perl-yaml-syck-1.25-1 xmlto-0.0.25-2

Total Download Size: 0.06 MiB
Total Installed Size: 0.49 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages ...
error: failed retrieving file 'perl-yaml-syck-1.25-1-armv6h.pkg.tar.xz' from mirror.archlinuxarm.org : The requested URL returned error: 404 Not Found
warning: failed to retrieve some files
error: failed to commit transaction (download library error)
Errors occurred, no packages were upgraded.
==> ERROR: 'pacman' failed to install missing dependencies.
')

any idea how to solve this?

[novitsky]

OK. solved this one by updating the pacman and changing the mirror.
$this->bbcode_second_pass_code('', 'pacman -Syy')

but now I have this error:

$this->bbcode_second_pass_code('', ' -> Found patch-3.6.11.4-rt36.patch
==> ERROR: Integrity checks (md5) differ in size from the source array.')

[novitsky]

Ok, solved this one as well:
run:
$this->bbcode_second_pass_code('', 'md5sum patch-3.6.11.4-rt36.patch')
and copy the number to the md5sums=() section at the end of the PKGBUILD.

Now I wait for the build to end.

[novitsky]

I had a problem with the patching:
$this->bbcode_second_pass_code('', '...
patching file net/core/skbuff.c
Hunk #2 succeeded at 348 with fuzz 2 (offset 2 lines).
Hunk #3 succeeded at 361 with fuzz 2 (offset 5 lines).
Hunk #4 succeeded at 395 with fuzz 1 (offset 14 lines).
patching file net/core/sock.c
Hunk #1 succeeded at 2204 (offset -6 lines).
patching file net/ipv4/icmp.c
patching file net/ipv4/ip_output.c
patching file net/ipv4/sysctl_net_ipv4.c
patching file net/mac80211/rx.c
patching file net/netfilter/core.c
patching file net/packet/af_packet.c
patching file net/rds/ib_rdma.c
patching file scripts/mkcompile_h
==> ERROR: A failure occurred in build().
Aborting...
')

any suggestions on how to solve this or how to debug?