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first of all with 11.2. direct using RAW devices is not supported anymore. However you can use RAW devices below ASM. So if you use ASM for datafiles, archivelogs etc, then the ASM disks can be RAW devices.
Second: A general comment on RAW devices under Linux. RAW devices under Linux have been deprecated (I believe with RHEL 5.3), so I recommend using block devices directly (which is possible since 10.2.0.2).
No to your question:
With 11gR1 the configuration of RAW devices has not changed.
With 11gR2 the configuration has changed. See Grid Infrastructure Installation Guide for further and exact information (about setup, user rights etc).