[U-Boot-Users] [PPC] PLEASE READ - was: [PATCH] Fix linker scripts: add NOLOAD atribute to .bss/.sbss sections

Stefan Roese
2008-02-04T10:37:00Z

Hi Wolfgang,

On Monday 04 February 2008, Wolfgang Denk wrote:
> A possible approach to this problem is to avoid using a global
> register variable and use a plain global variable instead. The
> necessary code for this is already there (just commented out); when I
> implemented this initially, I decided to use a global register
> variable because it gave slightly smaller code.
>
> Here is an overview of the effect (test build of current top of tree
> for the "katmai" (PPC440SPe) board):
>
> ELDK Version Register-Var. Globale Var.
> text data bss dec text data bss dec
> 4.0 243292 13700 322340 579332 244160 13808 322340 580308
> 4.1 243292 13700 322340 579332 244160 13808 322340 580308
> 4.2 section ... overlaps previous 245496 13188 322340 581024
>
> As you can see, the difference in code size is less than 1 KiB.

Nice.

> My suggestion is to change the code to use a plain global variable,
> however I need feedback if we can / want to do that as it effects
> *ALL* PowerPC boards.

Acked-by for this change from me. I tested successfully on AMCC Katmai, which
now fits again in the 256k with GCC 4.2.2.

Thanks.

Best regards,
Stefan

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