[Buildroot] ffmpeg issue with MIPS

[Buildroot] ffmpeg issue with MIPS

[Johannes Schmitz]

Short summary of a MIPS (ci20) related bug:

In
"package/ffmpeg/ffmpeg.mk"
the decision is made to build ffmpeg with or without mipsfpu support:

ifeq ($(BR2_mips)$(BR2_mipsel)$(BR2_mips64)$(BR2_mips64el),y)
ifeq ($(BR2_MIPS_SOFT_FLOAT),y)
FFMPEG_CONF_OPTS += --disable-mipsfpu
else
FFMPEG_CONF_OPTS += --enable-mipsfpu
endif
endif # MIPS

This apparently goes wrong in a ci20 build.
Result:
squeezelite can not be executed.
See:
https://pastebin.com/nsseiAdV
Error is at the end
trying file=/usr/lib/libavcodec.so.57  -> needs FR1 mode

Regards
Johannes
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[Buildroot] ffmpeg issue with MIPS

[Thomas Petazzoni]

Hello,

On Wed, 3 Jan 2018 22:43:40 +0100, Johannes Schmitz wrote:
> Short summary of a MIPS (ci20) related bug:
> 
> In
> "package/ffmpeg/ffmpeg.mk"
> the decision is made to build ffmpeg with or without mipsfpu support:
> 
> ifeq ($(BR2_mips)$(BR2_mipsel)$(BR2_mips64)$(BR2_mips64el),y)
> ifeq ($(BR2_MIPS_SOFT_FLOAT),y)
> FFMPEG_CONF_OPTS += --disable-mipsfpu
> else
> FFMPEG_CONF_OPTS += --enable-mipsfpu
> endif
> endif # MIPS
> 
> This apparently goes wrong in a ci20 build.
> Result:
> squeezelite can not be executed.
> See:
> https://pastebin.com/nsseiAdV
> Error is at the end
> trying file=/usr/lib/libavcodec.so.57  -> needs FR1 mode

I guess this has been discussed on IRC, but the discussion has been
very long, and I didn't follow all of it. So here are some basic
questions:

 - What is your Buildroot configuration ?

 - What is the exact MIPS processor you're running this on ?

 - Does it work when --disable-mipsfpu is passed, or when
   --enable-mipsfpu is passed ?

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[Buildroot] ffmpeg issue with MIPS

[Thomas Petazzoni]

Hello,

Please keep the Buildroot mailing list in Cc. Thanks!

On Wed, 3 Jan 2018 22:56:33 +0100, Johannes Schmitz wrote:

> >  - What is your Buildroot configuration ?
> >
> >  - What is the exact MIPS processor you're running this on ?
> >
> >  - Does it work when --disable-mipsfpu is passed, or when
> >    --enable-mipsfpu is passed ?
> >  
> 
> - glibc toolchain

I need the exact Buildroot .config file, to see which specific CPU you
have chosen, and other configuration knobs.

> - It does work when --disable-mipsfpu is forced

OK.

> - See hardware information here: https://elinux.org/CI20_Hardware
> 
> - additional FPU related information we found during the discussion:
> https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking#10.5.2._Setting_the_FPU_mode

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[Buildroot] ffmpeg issue with MIPS

[Johannes Schmitz]

2018-01-03 23:05 GMT+01:00 Thomas Petazzoni <
thomas.petazzoni@free-electrons.com>:

> Hello,
>
> Please keep the Buildroot mailing list in Cc. Thanks!
>
> On Wed, 3 Jan 2018 22:56:33 +0100, Johannes Schmitz wrote:
>
> > >  - What is your Buildroot configuration ?
> > >
> > >  - What is the exact MIPS processor you're running this on ?
> > >
> > >  - Does it work when --disable-mipsfpu is passed, or when
> > >    --enable-mipsfpu is passed ?
> > >
> >
> > - glibc toolchain
>
> I need the exact Buildroot .config file, to see which specific CPU you
> have chosen, and other configuration knobs.
>

Here is the .config
https://pastebin.com/kHK8H9hh


> > - It does work when --disable-mipsfpu is forced
>
> OK.
>
> > - See hardware information here: https://elinux.org/CI20_Hardware
> >
> > - additional FPU related information we found during the discussion:
> > https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_
> FR1_Interlinking#10.5.2._Setting_the_FPU_mode
>
>
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[Buildroot] ffmpeg issue with MIPS

[Johannes Schmitz]

Guys, please also see the related GCC option

-mabi=

https://gcc.gnu.org/onlinedocs/gcc/MIPS-Options.html

"GCC supports a variant of the o32 ABI in which floating-point registers
are 64 rather than 32 bits wide. You can select this combination with
-mabi=32 -mfp64. This ABI relies on the mthc1 and mfhc1 instructions and is
therefore only supported for MIPS32R2, MIPS32R3 and MIPS32R5 processors."

Ingenic JZ4780 is a MIPS32R2 architecture

https://elinux.org/Ingenic_JZ4780

Am 03.01.2018 23:13 schrieb "Johannes Schmitz" <johannes.schmitz1@gmail.com
>:

>
> 2018-01-03 23:05 GMT+01:00 Thomas Petazzoni <thomas.petazzoni@free-
> electrons.com>:
>
>> Hello,
>>
>> Please keep the Buildroot mailing list in Cc. Thanks!
>>
>> On Wed, 3 Jan 2018 22:56:33 +0100, Johannes Schmitz wrote:
>>
>> > >  - What is your Buildroot configuration ?
>> > >
>> > >  - What is the exact MIPS processor you're running this on ?
>> > >
>> > >  - Does it work when --disable-mipsfpu is passed, or when
>> > >    --enable-mipsfpu is passed ?
>> > >
>> >
>> > - glibc toolchain
>>
>> I need the exact Buildroot .config file, to see which specific CPU you
>> have chosen, and other configuration knobs.
>>
>
> Here is the .config
> https://pastebin.com/kHK8H9hh
>
>
>> > - It does work when --disable-mipsfpu is forced
>>
>> OK.
>>
>> > - See hardware information here: https://elinux.org/CI20_Hardware
>> >
>> > - additional FPU related information we found during the discussion:
>> > https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_
>> Interlinking#10.5.2._Setting_the_FPU_mode
>>
>>
>
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