Stefan Fischer just uploaded a new version (V4.3) of rpi_hal
to

https://github.com/rudiratlos/rpi-hal

Added some new functions to V4.3 like:
SW Maintenance-/Service-functions:
– Upload Logfiles to FTP-Server
– Download new SW from FTP-Server
– Install new SW on rpi

Source: http://forum.lazarus.freepascal.org/index.php/topic,20991.msg232445.html#msg232445