[U-Boot-Users] Why are some global vars part of the image, and some not?

Scott Wood scottwood at freescale.com
Mon Nov 6 21:48:50 CET 2006

Wolfgang Denk wrote:
> The concept of BSS for using uninitialized data (meaning: implicitely
> initialized to zero)

However, with the current u-boot linker scripts (some of them, at least; 
I'm not going to make a sweeping statement about all 270), data 
*explicitly* initialized to zero is also going in the bss.  Combined 
with the fact that some C code is executed before the bss is cleared, 
that is simply evil.

> is as old as C and Unix, actualy even older than
> that (from IBM 7090  times,  IIRC).  It  is  simple,  efficient,  and
> powerful.

Your point being?  I'm not attacking the concept of a bss, just the use 
of it in a codebase where C code is executed prior to being able to 
clear the bss.

> I see zero reason to drop it.

I have stated the reason.  If you prefer an environment that invites 
bugs and ugly workarounds thereto, then suit yourself.


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