I have an original Raspberry Pi B and haven't been able to get PiCore to work on it.  I have tried both 14 and 15 versions and get the same results.  I created an SD card with the image and it will boot fine.  I followed the instructions in the README file to adjust the size of the partition, etc.  With that, it works fine as a non GUI system.  However, running startx revealed that the GUI wasn't installed.  When I ran tce-load -i TC.tcz it didn't find it and I found I needed to download the .tcz file (I didn't see the -wi until later).  I did find some instruction how how to download the .tcz files to the "Optional" directory which I did.  Then I rand tce-load -i TC.tcz.  Id started out fine, but ended up getting errors resulting from a missiong desktop.sh script.  That was apparently supposed to be automatically deployed to the /usr/bin directory, but wasn't.  I have run the above steps multiple times, and also tried version 14 in addition to 15 with the same result.  After some playing and manually installing the flwm_topside extension the desktop.sh file appeared, so I saved it off and started over.  This time I manually copied the desktop.sh script to /usr/bin before running tce-load -i TC.tcz.  Then it installed with no errors.  After launching the GUI with startx, I found that the only application that would run was the terminal app.  The rest of the icons in the dock at the bottom of the screen did nothing when I clicked on them, including exit.  The popup menu options also did not work.  It appears that something is still missing in the installation.  Any suggestions would be appreciated. I should mention that I downloaded the armv6 version of everything I used.