[U-Boot-Users] U-Boot with gcc-3.3.2 and ARM926EJS Targets fails due to __udi

[Anders Larsen]

Markus Pietrek <maillist at fsforth.de> schreibt:
>For my target the compiler is using his internal libgcc.a:__div0 routine
>which 
>of course fails (it's an SWI instruction). But compiling U-Boot for an 
>smdk2410 platform with the same compiler uses the correct U-Boot's own
>__div0 
>code. I can't see any relevant differences in both build lines.

Hi,

your compiler wasn't built for a stand-alone target, otherwise
it would have included a full implementation of __div0, __udivsi3 etc.
However, there might be an easy solution to your problem, see below.
>
>Can anyone help me? And is it really necessary to include libgcc.a?
>
>The build line for the NS9750:
>========================
>/usr/local/LxNETES-3/arm-linux/lib/gcc-lib/arm-linux/3.3.2/libgcc.a(_udivsi3.o)
>                              drivers/libdrivers.a(serial_ns9750.o) 
>(__udivsi3)

>The build line for SMDK2410
>========================
>lib_arm/libarm.a(_udivsi3.o)  cpu/arm920t/libarm920t.a(speed.o)
>(__udivsi3)

The reason for the difference is the link order:
For SMDK2410, __udivsi3 is needed by a module linked before libarm.a
(in this case, cpu/arm920t/speed.c), whereas for NS9750 no module
before or in libarm.a needs it; drivers/libdrivers.a is linked after
libarm.a, so the linker won't go back to get __udivsi3 there and falls
back to using libgcc.a, which is linked last.

One solution could be to change the link order (link libarm.a last);
another (dirty) solution to add some code to your board-specific code
that needs __udivsi3.
I'd prefer the former, of course.

Please try the attached quick patch and let us know if it solves the
problem (or if it breaks thing). Caveat - I haven't tried it myself
yet!

Cheers
 Anders

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