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

Stefan Roese
2008-01-13T13:59:18Z

Hi Wolfgang,

On Saturday 12 January 2008, Wolfgang Denk wrote:
> In message <1197026214-31034-1-git-send-email-wd@denx.de> you wrote:
> > With recent toolchain versions, some boards would not build because
> > or errors like this one (here for ocotea board when building with
> > ELDK 4.2):
> > ppc_4xx-ld: section .bootpg [fffff000 -> fffff23b] overlaps section .bss
> > [fffee900 -> fffff8ab]
> >
> > For many boards, the .bss section is big enough that it wraps around
> > at the end of the address space (0xFFFFFFFF), so the problem will not
> > be visible unless you use a 64 bit tool chain for development. On
> > some boards however, changes to the code size (due to different
> > optimizations) we bail out with section overlaps like above.
> >
> > The fix is to add the NOLOAD attribute to the .bss and .sbss
> > sections, telling the linker that .bss does not consume any space in
> > the image.
> >
> > Signed-off-by: Wolfgang Denk <wd@denx.de>
>
> Applied, after re-rworking it for the boards changed, renamed or
> added meanwhile.

Thanks. This fixes overlapping problems with bss as seen on Ocotea with
ELDK 4.2. But unfortunately I still have other overlapping problems for
example on Katmai with ELDK 4.2:

[stefan at ubuntu u-boot (master)]$ ./MAKEALL katmai
Configuring for katmai board...
44x_spd_ddr2.c: In function 'initdram':
44x_spd_ddr2.c:392: warning: 'selected_cas' may be used uninitialized in this function
ppc_4xx-ld: section .bootpg [fffff000 -> fffff377] overlaps section .data.rel.local [ffffeba8 -> fffff3f7]
ppc_4xx-ld: u-boot: section .bootpg lma 0xfffff000 overlaps previous sections
ppc_4xx-ld: u-boot: section .data.rel.ro lma 0xfffff3f8 overlaps previous sections
ppc_4xx-ld: u-boot: section .u_boot_cmd lma 0xfffff408 overlaps previous sections
make: *** [u-boot] Error 1

These error are not seen with ELDK 4.1 by the way. Any ideas what might
be causing this and/or how to solve it?

Thanks.

Best regards,
Stefan

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