Building firmware with gcc

[tormod]

@ant9000

To make USB_Init work I guess you need to apply to the APP and LIB ASM_Function.s the same kind of massaging I’ve done with IAR’s linker directives - see the the changes on the svn here.

I have not tried on gcc yet, but instructing the linker to place code at a fixed address does not seem to be much harder than it has been with IAR, judging by this thread: How to locate variable at fixed address?

You should be able to quickly poke at the linker config files, and then modify your iar2gas script in order to translate the relevant instructions from IAR jargon to gcc parlance.

I think I have pretty much taken care of this by linking ASM_Functions.o first, so the branch tables always ends up at the start of the .text section and have stable addresses. For now, I have given up iar2gas and tweak the gcc assembly files by hand.

Instead of adding any addresses to the linker script, I think BenF’s suggestion in the other thread about storing the branch table address inside the LIB vector table would make sense.