RE: debugging custom Xilinx boot loader with abatron and Montavistadevrocket

1) In DevRocket, what kind of project do you choose to debug an
externally build .elf file?
MontaVista support engineers had no clue.

Not sure about DevRocket specifically, but in Eclipse you would choose a C
application with external makefile.  In Eclipse 3.1 (with CDT) its specifically
called a "Standard Make C Project".  There's also something similar in the
Xilinx EDK Eclipse-based offering (called Platform Studio SDK).  The PS-SDK
defaults to using backend xmd/gdb through the FPGA JTAG port.

My personal preference is to use gdb standalone or ddd/gdb

2) How do you use DevRocket to create a cross compiled set of code
linked to a specific address.
MontaVista support engineers also had no clue on this one.

Again, not sure in DevRocket.  In general, you will want to use a custom
linker script.  You can tailor a linker script from one of your EDK projects.
To pass it into the linker (ld), use the -T option.  Another useful option is
-M to create a map file.  If you're calling the linker from gcc, remeber to
preface these options with -Wl. man ld and man gcc are your friends.

If you get really stuck, you can look at a the makefile from an example EDK
project and see what it is doing.