Motorola Shared BSPs not Linking

[Ralf Corsepius]

On 04/04/2012 03:34 PM, Ralf Corsepius wrote:
> On 04/04/2012 02:49 PM, Ralf Corsepius wrote:
>> On 02/23/2012 05:15 PM, Till Straumann wrote:
>>>
>>> My last build of 'master' still linked fine but that's been a while
>>> (7/2011, I believe).
>>
>> FYI: I have narrowed down this breakdown to binutils.
>>
>> At least for me, building the mcp750 with gcc-4.6.x or gcc-4.7.0, _both_
>> fail when using binutils-2.22, but both do _not fail_ when using
>> binutils-2.20.1.
>
> It also works with binutils-2.21.1.
>
> => this issue was introduced between 2.21.1 and 2.22.
FWIW: As far as I can gather is a behavioral change in ld since 
binutils-2.22

It seems to error out when linkage encounters references to undefined 
symbols in linker scripts. This is unlike binutils < 2.22, which seem to 
have silently ignored them and "set them to 0".

That said, the patch below fixes this issue for me:

index a2567a9..3ea50bb 100644
--- a/c/src/lib/libbsp/powerpc/shared/bootloader/ppcboot.lds
+++ b/c/src/lib/libbsp/powerpc/shared/bootloader/ppcboot.lds
@@ -78,6 +78,7 @@ SECTIONS
    }
    PROVIDE(_binary_initrd_gz_start = 0);
    PROVIDE(_binary_initrd_gz_end = 0);
+  PROVIDE(__rtems_start = 0);
    _rtems_gz_size = _binary_rtems_gz_end - _binary_rtems_gz_start;
    _rtems_size = __rtems_end - __rtems_start;
    .bss :

Unless somebody objects, I am going to commit it.

Ralf