linux-kernel - Re: avr32 build failures in linux-next

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Message-ID: <yw1xwpqiey5d.fsf@unicorn.mansr.com>
Date:	Sat, 06 Feb 2016 14:01:02 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Hans-Christian Noren Egtvedt <egtvedt@...fundet.no>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Haavard Skinnemoen <hskinnemoen@...il.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: avr32 build failures in linux-next

Hans-Christian Noren Egtvedt <egtvedt@...fundet.no> writes:

>>>Example for avr32:defconfig:
>>>
>>>fs/built-in.o: In function `anon_inode_getfile':
>>>(.text+0x2ae90): relocation truncated to fit: R_AVR32_21S against
>>>`.text'+296c0
>>>
>>>All builds but avr32:allnoconfig fail with such truncated relocations.
>
> Weirdly I do not get this when I build torvalds/master with allnoconfig.
>
> The avr32 kernel was never very fond of CONFIG_CC_OPTIMIZE_FOR_SIZE=n, it
> was always built with CONFIG_CC_OPTIMIZE_FOR_SIZE=y for actual usage.

4.5-rc1 builds and runs with CONFIG_CC_OPTIMIZE_FOR_SIZE=n here.  It's a
fairly minimal config though.

>>>Toolchain used is the old gcc 4.2.4 toolchain from kernel.org. I have been
>>>unable to find or build newer versions of gcc for avr32.
>>>
>>>Does anyone know if a more recent toolchain for avr32 is available ?
>> 
>> https://sourceware.org/ml/crossgcc/2015-10/msg00050.html
>> says avr32 has been depreciated.
>
> Last release of avr32-linux GCC was the 4.2.4 patches in Buildroot for AVR32.
>
> Atmel never upstreamed the AVR32 patches for GCC.

There are patches for gcc 4.4.3 at
http://distribute.atmel.no/tools/opensource/avr32-gcc/
The patches apply with only trivial fixes to 4.4.7 as well.  I tried
forward-porting to something newer, but my knowledge gcc internal voodoo
wasn't sufficient.

>>>Another question is if the avr32 kernel still supported, or if I should
>>>just stop trying to build test it. Any thoughts ?
>> 
>> I have already stopped building it.
>
> I build the kernel and try to fix small issues here and there.

Even when it builds, it often doesn't work since non-DT support has
bitrotted in many drivers.

-- 
Måns Rullgård