RTLinux Preemptable kernel

INSTALLATION NOTES

1) Download a fresh kernel version from the ocera distribution. It
   should be a Linux 2.4.18 with 'BigPhysArea' and 'LowLatency'
   patches already applied. The RTLinux version should be a 3.2pre1. 
   Suppose you put these kernels in ocera/kernel/

2) Apply the RT-Linux patch found in RT-Linux /patches directory:
 
     cd ocera/kernel/linux
     patch -p1 < ../rtlinux/patches/kernel_patch-2.4.18-rtl3.2-pre1
   
   the patch should apply clearly with no Hunks

3) Patch Linux kernel with patch-linux-rtl3.2-preemption

     patch -p1 < ../../components/qos/pcomp/patch-linux-rtl3.2-preemption

4) Patch RT-Linux with patch-rtlinux-rtl3.2-preemption

     cd ../rtlinux
     patch -p1 < ../../components/qos/patch-rtlinux-rtl3.2-preemption

   And now you are set!

This version of RT-Linux preemptable kernel is tested to work with
RT-Linux 3.2pre1 and with Linux kernel 2.4.18. It has been tested with
'Preemption', 'Bigphysarea' and 'LowLatency' patches enabled but on
'386' uniprocessor only with no 'Symmetric multi-processing support'
and no 'Local APIC support on uniprocessors'. It has been tested using
the Linux Test Project (http://ltp.sourceforge.net), and the rtlinux
examples.

Documentation

A complete documentation on how this patch works will be soon
available on the ocera cvs.

Related work

See preemption patch documentation for detailed information on
preemptible kernel, all this work is based upon Robert Love
<rml@tech9.net> Preemptible Kernel work
(http://www.tech9.net/rml/linux/).