[PicForth] Problem with libstrings.fs and the bootloader

[Alex Holden]

Alex Holden wrote:
> Using the bootloader, I get a huge amount of garbage printed out instead 
> of the expected "Hello World\r\n".

OK, after disassembling a hex file read from a chip that was programmed 
using the bootloader and comparing it to what was expected, I've figured 
out what the problem is.

If a program doesn't include picisr.fs, picforth starts compiling words 
at location 3 in the program memory. pfd.py relocates the first four 
instructions to somewhere else in program memory. In my case the first 
word that was compiled was flash-read, which is called by str-char. The 
upshot being that first instruction of flash-read got replaced by pfd.py 
with a nop.

A workaround is to include picisr.fs even if you don't need it, because 
it causes words to be compiled starting at location 4 instead of 
location 3. Any ideas on a better way to fix this?

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer