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I installed it the way you showed, but again it gave error. I am using mipssf and it gives socket error in this version. the version you described is different (mipsel)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/opt/var/run/mysqld/mysqld.sock' (2)
Is there a opkg package to install mysql server omni dsl device without any problem