Bootloader loader.
This is a small bootloader that can be loaded into the i.MX internal RAM, initialize the DDR2, then start reading from the UART and copying into DDR2.  

It's C-code, but the stack isn't initialized, so it's not going to work right with function calls, and perhaps with locally defined variables.  This can probably be worked out by diddling the stack a little at the top of main, or making a simple c_init function that's the entry point. 

To make it go:

# make
# ../arm-2008q1/bin/arm-none-eabi-readelf -a test | head -25

Look at the .text section.  it will have a 'size' column.  Take that and convert it to decimal.  So, if size is 4e0, then use 1248 below

# tail -c +32769 test | head -c 1248 > test.bin     # This grabs just the .text section out of the ELF output file and copies it to test.bin

Then in PEEDI (For the moment....), do this:
baby> halt
baby> memory load tftp://172.19.115.140/test.bin bin 0x78000000
baby> set pc 0x78000000
baby> go

There's no reason this shouldn't work with the serial bootloader I already wrote.  

What Works:
UART Read
UART Write
DDR2 initialization
Serial Port reconfiguration

What's TODO
* Make simple protocol to copy image to DDR2:
* Something like:
	  int32:  size
	  int32:  entry-point
	  int32:  crc
	  char[]: bunch-of-data
* Check CRC
* Jump to entry-point