[okl4-developer] Elfweaver Failure

[Robert Wetzel]

Malcolm Purvis wrote:

> Thanks for the extra detail.  Could you also send the output of 'readelf
> -e' on the kernel file, plus the command that you used to create the
> files and build the image?  Are you using the toolchains downloaded from
> our site?
> 
> What mystifies me is the duplicate kernel sections in image.elf:
> 
>   [29] kernel.text       PROGBITS        f0000000 008000 013bc4 00  AX  0   0 32
>   [30] kernel.text       PROGBITS        f0000000 038000 013bc4 00  AX  0   0 32
>   [31] kernel.rodata     PROGBITS        f0013bc4 01bbc4 00853c 00   A  0   0  8
>   [32] kernel.rodata     PROGBITS        f0013bc4 04bbc4 00853c 00   A  0   0  8
> 
> That's very wrong, and I'm not surprised that 'elfweaver modify' is
> having trouble with it.

I've stumbled into these, but they never raised the red flag; thanks for pointing
that out. Following this, I've run some tests, and it boils down to a problem initially
generated by the toolchain. There are three I tested the build with: The gcc 3.4.4 NICTA
toolchain, and two "homegrown" gcc toolchains, 3.4.6 and 4.1.1. The version 3 toolchains
went both through smooth, however the 4.1.1 toolchain generates the mentioned problems.
Looking at the readelf output (see below / attachments) shows that the most obvious
difference are the two additional sections generated by gcc 4.1.1:

   [15] .ctors            PROGBITS        f002e000 036000 000004 00  WA  0   0  4
   [16] .text._ZN18tcb_sy PROGBITS        f002f000 067000 000064 00  AX  0   0  4

Maybe these are the cause for the problems, no idea.

The command line I used to build was 2.1 style:

   tools/build.py machine=gumstix project=iguana pyfreeze=false toolprefix=${TOOLCHAIN_PREFIX}

(without the toolprefix argument when using the NICTA toolchain). The kernel as such starts up
using the gcc 3.x builds; the userland obviously needs a different compiler as outlined in other
posts (is there something like "pistachio.toolprefix" as build option?).


Robert
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