[Buildroot] [noMMU] How to generate FLAT executable for busybox?

[Thomas Petazzoni]

Dear Axel Lin,

On Wed, 31 Jul 2013 21:05:56 +0800, Axel Lin wrote:

> Just try to figure out if any platform can build FLAT executable.
> So I just tested build for blackfin (BR2_bfin).
> ( I don't have any customization for this blackfin build test,
> only run make menuconfig and select blackfin. Test with current git tree. )
> 
> I thought I should have a FLAT executable, however it produces ELF executable.
> $ file output/target/bin/busybox
> output/target/bin/busybox: setuid ELF 32-bit LSB executable, Analog
> Devices Blackfin, version 1 (SYSV), statically linked, stripped

Yeah, that's broken.

> BTW, I found BR2_ELF2FLT is invisible for BR2_bfin.
> 
> package/elf2flt/Config.in.host:
> config BR2_PACKAGE_HOST_ELF2FLT
>         bool "Enable elf2flt support?"
>         depends on BR2_arm || BR2_sh || BR2_sparc
> 
> Does this mean blackfin does not need elf2flt tool?

No, it means that the internal toolchain handling of FLAT binaries and
elf2flt is broken.

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