[yocto] Build core2 (i686) U-Boot for a core-i7 (amd64) image

[Ferry Toth]

Op Mon, 17 Jul 2017 22:49:51 -0400, schreef Khem Raj:

> On Mon, Jul 17, 2017 at 3:02 PM, Ferry Toth
> <ftoth at telfort.nl> wrote:
>> On edison U-Boot is 32 bit. I'm building a 64 bit kernel + rootfs.
>>
>> The only recipy that fails is U-Boot with:
>> undefined reference to `__normal___udivdi3'
>>
>>
> this means gcc is generating a helper call which it assumes libgcc will
> provide but here the toolchain in multilib env might be not providing
> it.

I am not using multilib yet, as I don't know exactly how to do that. 
Actually that is my question.

> One solution is to rewrite the code such that this call is not generated
> by gcc. So help the compiler.

Rewrite U-Boot to not use this helper, that doesn't sound right.

I would rather tell this specific recipe to use the 32 bit compiler, 
while all other recipies are built with 64. 

>> Apparently, when building 32 bit U-Boot outside of yocto on a 64bit
>> machine you need to install gcc-6-multilib.
>>
>> How would I configure poke or change the recipe to do the same?
>>
>>
>> --
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