[U-Boot] [PATCH] ARM: bcm2835: config.mk isn't needed

[Andreas Färber]

Am 29.01.2014 19:38, schrieb Stephen Warren:
> On 01/29/2014 02:22 AM, Andreas Färber wrote:
>> Am 29.01.2014 06:42, schrieb Stephen Warren:
>>> The entries in config.mk were needed so that U-Boot could be built
>>> with an old version of the Raspberry Pi Foundation's toolchain. Without
>>> them, the build would error out with:
>>>
>>> ...-ld: error: .../libgcc.a(_bswapsi2.o) uses VFP register arguments,
>>> u-boot does not
>>>
>>> However, none of the 3 toolchains in the latest version of their
>>> tools.git, nor the Ubuntu/Linaro ARM compilers in at least Ubuntu Quantal
>>> or Saucy, need these options set in order to compile a working U-Boot.
>>> Hence, remove the options for simplicity.
>>>
>>> Reported-by: Tom Rini <trini at ti.com>
>>> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
>>> ---
>>>  arch/arm/cpu/arm1176/bcm2835/config.mk | 19 -------------------
>>>  1 file changed, 19 deletions(-)
>>>  delete mode 100644 arch/arm/cpu/arm1176/bcm2835/config.mk
>>
>> No objection against the patch, but why was arch/arm/config.mk using
>> -msoft-float in the first place?
> 
> It wasn't. It was filtering -msoft-float out of the compiler flags,
> which then left the ABI up to the toolchain default, which was hardfp
> for one of the Raspberry Pi Foundation's toolchains - the same one that
> caused the error messages quoted above unless -msoft-float was removed
> from the compiler options.

You seem to have misread my question, it was not about bcm2835/config.mk
but about arm/config.mk, which bcm2835 was filtering.

I didn't quite get Tom's response about U-Boot being soft-float. It is
what I compile it to be, no? If I compile it with an hardfp toolchain
such as openSUSE's, without -msoft-float it is going to be hardfp IIUC.
softfp is for compatibility with non-VFP hardware I thought, but U-Boot
is clearly built with a per-board config, so it's not portable anyway.

Andreas

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