Re: [microblaze-uclinux] Loadable module support for Petalinux w/MMU?

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Steve,

Thanks for your detailed notes, please see my comments below:

Steven Hein wrote:

> * Using petalinux-mmu-v0.10 without any mods, the printk's
> in my loadable modules failed, as previously documented.
>
> * Using petalinux-mmu-v0.10 with John's fix (to #ifdef out
> the split relocs fix), the printk's worked, but the strings
> initialized within a structure (i.e. in my test code below) failed.
>
> * Using the latest SVN kernel code (currently rev. 4469), which
> contains the split relocs fix, it failed as above (printk's worked,
> strings in structures were garbled).

One more thing to try, in the R_MICROBLAZE_32 reloc we also have the 
"old_value=...; value+=" construct.

Please try changing that to just "*location = value;" and see if it 
fixes the strings issue.

> * When I remove the split relocs fix, and build the kernel module
> with the uclinux compiler (microblaze-uclinux-gcc), it works
> correctly (printk's and strings work) when loaded into the
> MMU kernel (glibc built).
>
> So I have a solution that works: build the modules with
> the microblaze-uclinux-gcc compiler.     Is there a better solution
> at this point?    Am I doing something to cause this?

It's certainly not your fault, it's an interaction between the 
toolchain/linker and the module loader.


Cheers,

John
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