Re: Building for i486 based non-FPU device

[Koen Kooi <k.kooi@student.utwente.nl>]

On 26-01-09 10:11, Marco Cavallini wrote:
> Hello,
> This discussion was in thread "FOSDEM OE stand"
> I'm trying to build for a machine I'd like to let at OE stand.
> http://www.koala.it/it/nanopc.htm
> It's a i486 based non-FPU device (Vortex86sx), so I tried to build
>
> DISTRO = "angstrom-2008.1"
>
> I created my new machine copying it from
>   conf/machine/i586-generic.conf
> and changing the following settings:
>   TARGET_ARCH = "i486"
>   PACKAGE_EXTRA_ARCHS = "x86"
>   PREFERRED_VERSION_linux = "2.6.26"
> (I also changed 2.6.26 recipe)
>
> I found several problems:
> i586-generic uses TARGET_ARCH = "i586" : ok but for 586
> x86          uses TARGET_ARCH = "i586" : build broken
> qemux86      uses TARGET_ARCH = "i586" : not used
> i486-generic uses TARGET_ARCH = "i486" : build broken
>
> No one of the previous tested build give a useful result,
> what could I change to get a running system?
>
> Maybe do I have to specify TARGET_CC_ARCH = "-march=i486" ?
> Would be better to switch this discussion to IRC ?
> Any hint will be greatly appreciated.

'MACHINE=vortex86sx bitbake glibc' works for me with angstrom. It 
doesn't use softfloat yes, as gccs configure script doesn't like 
--with-float=soft, so we'll problably end up messing with TARGET_CC_ARCH.

regards,

Koen