There's a link to my step-by-step no-nonsense guide on compiling and building both FPC and Lazarus on the RPi2 in this forum post: http://forum.lazarus.freepascal.org/index.php/topic,27257.0.html
Just replace the ARM 7 build params for ARM 6 and it'll compile just fine. I've done this on my RPi1 Model B.