[avr-gcc-list] bootloader not jumping back to app

[jeffrey traer bernstein]

i wrote a little bootloader, my first.
i put it in main and then relocated the .text section to 0x3800 (the top 
of the largest bootloader section on my mega16) and mostly everything is 
fine, the bootloader downloads the code and seems to put everything in 
the right place in the flash.

Problem is when i try to jump to 0x0000 using a function pointer or 
inline assembly the app code i loaded doesn't seem to start.

any ideas?