Got a question for the bootloader/flash gurus

Hi bkucera,

> So what happens to the .BSS section when you run elf2flash?

Nothing. Try objdump -h on your application elf. The .bss section is for uninitialized

objects (variables). A static object that isn't initialized (doesn't have an explicit

initializer) must be assigned the value 0 before main() is called.

When you look at the objdump -h output, you'll see that the .bss section has only

the "allocated" (ALLOC), but does not have the load attribute (LOAD) like .data

or .text. The allocated attribute basically means it occupies memory; the load

attribute means a loader must actually copy the elf section into the target memory.

The absence of the load attribute means the loader doesn't have to copy the

elf section to the target memory space.

crt0.s however, clears the target memory region since the C language requires

uninitialized objects to be set to zero prior to calling main().

Regards,

--Scott