Image location: http://autobuilder.yoctoproject.org/pub/releases/yocto-1.7_M3.rc2/machines/mpc8315e-rdb/

Git rev: master/429802fe6691c8a70ec9735c0db4c6a4e1e1b038

When run ltp test on mpc8315e-rdb, some rwtest cases hang.

Steps:
1. Boot up the system via harddisk
2. mkdir -p /opt/tmp; chmod 777 /opt/tmp
3. Add a config file test-rwtest in /opt/ltp/runtest/ :
###########################################   

rwtest02 export LTPROOT; rwtest -N rwtest02 -c -q -i 60s  -f buffered 10%25000:$TMPDIR/rw-buffered-$$
rwtest04 export LTPROOT; rwtest -N rwtest04 -c -q -i 60s -n 2  -f sync -s mmread,mmwrite -m random -Dv 10%25000:$TMPDIR/mm-sync-$$

############################################

4. Run command: /opt/ltp/runltp -p -f test-rwtest -d /opt/tmp