can i get all the patches of mpich-1.2.7p1 for centos 5.1 x86_64
You may want to explain in a bit more detail what you are looking for. Patches that do what? If you want ALL the patches for a particular application, you would download the source from the Centos repository and look in the source code for any patches they may have applied.
Also, if you're looking to run that version of mpich on centos 5.1 you might have problems, see link: