[Buildroot] Cross Toolchain support for blackfin

[Buildroot] Cross Toolchain support for blackfin

[Peter Korsgaard]

>>>>> "TarunJain" == TarunJain SM <TarunJain.SM@lntsec.com> writes:

 TarunJain> Hi,

Please send mails to the buildroot list, and not directly to me.

 TarunJain>  I am planning to build a cross tool chain for blackfin
 TarunJain> processor, for which i have download the latest available
 TarunJain> "buildroot-2010.02.tar.gz" in which i was unable to find the
 TarunJain> target architecture for blackfin, please guide me to the
 TarunJain> same.

Sorry, we don't have any blackfin support in Buildroot.

-- 
Bye, Peter Korsgaard

[Buildroot] Cross Toolchain support for blackfin

[Joachim Pihl]

On Fri, 21 May 2010 13:07:57 +0200, Peter Korsgaard <jacmet@sunsite.dk>  
wrote:

>>>>>> "TarunJain" == TarunJain SM <TarunJain.SM@lntsec.com> writes:
>
>  TarunJain> Hi,
>
> Please send mails to the buildroot list, and not directly to me.
>
>  TarunJain>  I am planning to build a cross tool chain for blackfin
>  TarunJain> processor, for which i have download the latest available
>  TarunJain> "buildroot-2010.02.tar.gz" in which i was unable to find the
>  TarunJain> target architecture for blackfin, please guide me to the
>  TarunJain> same.
>
> Sorry, we don't have any blackfin support in Buildroot.
>

I think the Blackfin toolchain as delivered by Analog Devices is based on  
(an old) Buildroot, maybe you should contact them to try and merge their  
efforts into the mainline?

-- 
Joachim Pihl
Senior R&D Engineer
Nevion

Tel: +47 33 48 94 66
Fax: +47 33 48 99 98
Mobile: +47 91 33 98 91
jpihl at nevion.com
www.nevion.com

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[Buildroot] Cross Toolchain support for blackfin

[Thomas Petazzoni]

On Fri, 21 May 2010 13:34:57 +0200
Joachim Pihl <jpihl@nevion.com> wrote:

> On Fri, 21 May 2010 13:07:57 +0200, Peter Korsgaard
> <jacmet@sunsite.dk> wrote:
> 
> >>>>>> "TarunJain" == TarunJain SM <TarunJain.SM@lntsec.com> writes:
> >
> >  TarunJain> Hi,
> >
> > Please send mails to the buildroot list, and not directly to me.
> >
> >  TarunJain>  I am planning to build a cross tool chain for blackfin
> >  TarunJain> processor, for which i have download the latest
> >  TarunJain> available "buildroot-2010.02.tar.gz" in which i was
> >  TarunJain> unable to find the target architecture for blackfin,
> >  TarunJain> please guide me to the same.
> >
> > Sorry, we don't have any blackfin support in Buildroot.
> >
> 
> I think the Blackfin toolchain as delivered by Analog Devices is
> based on (an old) Buildroot, maybe you should contact them to try and
> merge their efforts into the mainline?

I don't know how they did in the past, but these days, they use a
custom toolchain build script, documented at
http://docs.blackfin.uclinux.org/doku.php?id=toolchain:buildscript and
available at
http://blackfin.uclinux.org/git/?p=readonly-mirrors/toolchain.git;a=tree;f=buildscript;h=7ff71182924c2a2fc05553bc897c0bd4d53c7349;hb=HEAD.

The toolchains I got from them are not compiled with sysroot support so
they unfortunately can't be used as external toolchains in Buildroot
(which is why I started adding support for Blackfin in CT-NG). However,
their toolchains are higly multilib, something that CT-NG isn't capable
of doing at the moment.

Best regards,

Thomas Petazzoni
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] Cross Toolchain support for blackfin

[Thomas Petazzoni]

On Fri, 21 May 2010 13:07:57 +0200
Peter Korsgaard <jacmet@sunsite.dk> wrote:

>  TarunJain>  I am planning to build a cross tool chain for blackfin
>  TarunJain> processor, for which i have download the latest available
>  TarunJain> "buildroot-2010.02.tar.gz" in which i was unable to find
>  TarunJain> the target architecture for blackfin, please guide me to
>  TarunJain> the same.
> 
> Sorry, we don't have any blackfin support in Buildroot.

Well, in fact I have a beginning of something working here :

 * I've added very basic support for Blackfin in Crosstool-NG.
   Crosstool-NG is therefore able to generate a cross-compilation
   toolchain for Blackfin (FDPIC ELF binary format). The support is
   very, very basic and there are certainly some issues. This feature
   is available in Crosstool-NG 1.7.0.

 * I have made some very basic modification to Buildroot, and I'm able
   to generate a root filesystem for Blackfin with just Busybox (I
   haven't tried other packages at the moment). If you're interested in
   this basic beginning, let me know and I'll clean it up. However, be
   ready for some deep troubles : Blackfin support in CT-NG and
   Buildroot is really in pre-alpha-horribly-untested-buggy-stage.

For now, it only works with Busybox compiled statically, but the
filesystem boots on a real Blackfin platform. For some reason, dynamic
libraries do not work (dynamically-linked programs simply exit, without
any error message and I didn't had the time to investigate).

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com