Re: [Xenomai] ARM/BeagleBone Thumb2 Kernels

[Charles Steinkuehler <charles@steinkuehler.net>]

On 1/24/2014 5:22 AM, Gilles Chanteperdrix wrote:
> 
> Could you provide me with the details (kernel version or git url, config
> file used, toolchain used) allowing to reproduce this issue?

Tool chain: gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux

I'm building kernels for the BeagleBone, maintained as a set of patches
and scripts that apply to a clean kernel source tree.  The scripts can
be found here:

  https://github.com/cdsteinkuehler/linux-dev

Checkout the 3.8.13-bone37-xenomai branch.  Copy system.sh.sample to
system.sh and edit as needed for your system.  If you have a local copy
of linaro and the Linus kernel source, you can set CC= and LINUX_GIT= to
save a bunch of download time and drive space, otherwise the scripts
will install both for you.

If you set AUTO_BUILD=1 in the script, it will build a kernel
unattended.  If you don't set this, you'll be taken to menuconfig with
the default configuration loaded.

> I have been compiling thumb2 kernels for omap3 and omap4 for a long
> time, and never observed this issue. So, there must be something
> different in your case.

As I understand it, the issue arises as the kernel grows larger and the
distance between the branch and it's target increases.  My vmlinux for
the (fixed Thumb2 version) BeagleBone kernel is currently weighing in at
13225004 bytes.

-- 
Charles Steinkuehler
charles@steinkuehler.net

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