Mindboards

Hello,

LEGO distributes the NXT firmware as binary also as source code. I installed the free IAR compiler toolchain (v4.42) and tried to compile this source code.

There are two workbench-files (LMS-ARM and LMS-V02) which produce slightly different binaries. Even worse none of those binaries is equal to the binary delivered by LEGO. I know the file system is added at the original firmware - I already cut that part of. It still differs.

Why are they different? How can I get exactly the LEGO binary? What compiler is LEGO using? Really the "old" 4.42 or did they upgrade to 6.??

Thank you for the answers

Bye marvin

Me as this question interests. Experts help us to understand!

Hello everybody,

I tried to compile the source code with different options and found things out:

v1.29: Compiled by LEGO (delivered version) = 0x22050 bytes binary
Compiled by LEGO (LMS_V02.rfw file in source) = 0x21164 bytes binary
Compiled by me with the delivered lib = 0x21114 bytes binary
Compiled by me with the 4.42 lib = 0x21684 bytes binary

The difference is about 3900 bytes which is a bit much for a little difference...

v1.05: Compiled by LEGO = 0x20BB4 bytes binary
Compiled by me with v1.29-delivered lib = 0x1DA40 bytes binary
Compiled by me with the 4.42 lib = 0x1DE04 bytes binary

The difference is about 12000 bytes here!!!

v1.28 Enhanced:
No difference. Only some bytes are changed - I think date and time based bytes.

Did anyone use a self-compiled version?
If yes - is there any different behaviour to the "original" version?

A question to John: Do you know why there is this difference?

Bye - marvin

Unfortunately I do not know the reason for the differences you are seeing.

John Hansen