generate pid file after all checks in initialize_cape. also check for pru driver before mapping pru shared memory to prevent buss error.
generate pid file after all checks in initialize_cape. also check for pru driver before mapping pru shared memory to prevent buss error.

StrawsonDesign/Robotics_Cape_Installer,StrawsonDesign/Robotics_Cape_Installer,Andrewiski/Robotics_Cape_Installer,StrawsonDesign/Robotics_Cape_Installer,Andrewiski/Robotics_Cape_Installer,Andrewiski/Robotics_Cape_Installer