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Unbreakable Enterprise Kernel Release 3 (UEK R3) is only supported on the x86-64 architecture.
Oracle Linux 7
UEK R3 is the default boot kernel for fresh installations of Oracle Linux 7.
Oracle Linux 6
You can install UEK R3 on Oracle Linux 6 Update 4 or later, running either the Red Hat compatible kernel or a previous version of the Unbreakable Enterprise Kernel. If you are still running an older version of Oracle Linux, first update your system to the latest available update release.
Starting with Oracle Linux 6 Update 5 for x86-64, UEK R3 is the default boot kernel for fresh installations of Oracle Linux 6.
For systems that are currently running a previous version of the Unbreakable Enterprise Kernel (UEK R2) or the Red Hat compatible kernel (RHCK), you can switch to UEK R3 at any time. For details, see:
Kernel Source Code
The kernel's source code is available from a public git source
code repository at:
https://oss.oracle.com/git/?p=linux-uek3-3.8.git.