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Groups > linux.kernel > #1590630 > unrolled thread

[RFC] remove support for AVR32 architecture

Started byHans-Christian Noren Egtvedt <egtvedt@samfundet.no>
First post2017-03-01 22:20 +0100
Last post2017-03-06 21:00 +0100
Articles 6 — 5 participants

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Contents

  [RFC] remove support for AVR32 architecture Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> - 2017-03-01 22:20 +0100
    Re: [RFC] remove support for AVR32 architecture Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-03-01 22:50 +0100
    Re: [RFC] remove support for AVR32 architecture Boris Brezillon <boris.brezillon@free-electrons.com> - 2017-03-02 02:10 +0100
    Re: [RFC] remove support for AVR32 architecture Nicolas Ferre <nicolas.ferre@microchip.com> - 2017-03-02 17:10 +0100
    Re: [RFC] remove support for AVR32 architecture Håvard Skinnemoen <hskinnemoen@gmail.com> - 2017-03-06 07:10 +0100
      Re: [RFC] remove support for AVR32 architecture Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> - 2017-03-06 21:00 +0100

#1590630 — [RFC] remove support for AVR32 architecture

FromHans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Date2017-03-01 22:20 +0100
Subject[RFC] remove support for AVR32 architecture
Message-ID<tgjPc-og-5@gated-at.bofh.it>
Hello all,

The AVR32 architecture is not keeping up with the development of the kernel,
and since it shares so much of the drivers with Atmel ARM SoC, it is starting
to hinder these drivers to develop swiftly.

Also, all AVR32 AP7 SoC processors are end of lifed from Atmel (now
Microchip).

Finally, the GCC toolchain is stuck at version 4.2.x, and has not received
any patches since the last release from Atmel;
4.2.4-atmel.1.1.3.avr32linux.1. When building kernel v4.10, this toolchain is
no longer able to properly link the network stack.

Haavard and I have came to the conclusion that we feel keeping AVR32 on life
support offers more obstacles for Atmel ARMs, than it gives joy to AVR32
users. I also suspect there are very few AVR32 users left today, if anybody
at all.

I have prepared three patches in my for-linus branch in git tree
https://git.kernel.org/cgit/linux/kernel/git/egtvedt/linux-avr32.git

Shortlog below, patches not inlined as they are quite large IMHO.

I will send a formal pull request to Linus unless anybody objects loudly.

I have also prepare patches for removing AVR32 specific kernel drivers, I
will send those to the relevant subsystem maintainers.

Hans-Christian Noren Egtvedt (3):
      avr32: remove support for AVR32 architecture
      docs: remove all references to AVR32 architecture
      scripts: remove AVR32 support from checkstack.pl

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 .../features/time/virt-cpuacct/arch-support.txt    |    1 -
 .../features/vm/ELF-ASLR/arch-support.txt          |    1 -
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 Documentation/features/vm/THP/arch-support.txt     |    1 -
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 .../features/vm/huge-vmap/arch-support.txt         |    1 -
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 .../features/vm/numa-memblock/arch-support.txt     |    1 -
 .../features/vm/pte_special/arch-support.txt       |    1 -
 Documentation/media/v4l-drivers/soc-camera.rst     |    2 +-
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 272 files changed, 11 insertions(+), 27083 deletions(-)
 delete mode 100644 arch/avr32/Kconfig
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 delete mode 100644 arch/avr32/boards/atstk1000/atstk1002.c
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 delete mode 100644 arch/avr32/configs/favr-32_defconfig
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-- 
Best regards,
Hans-Christian Noren Egtvedt

[toc] | [next] | [standalone]


#1590644

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2017-03-01 22:50 +0100
Message-ID<tgkie-DA-1@gated-at.bofh.it>
In reply to#1590630
On Wed, Mar 1, 2017 at 10:44 PM, Hans-Christian Noren Egtvedt
<egtvedt@samfundet.no> wrote:
> Hello all,
>
> The AVR32 architecture is not keeping up with the development of the kernel,
> and since it shares so much of the drivers with Atmel ARM SoC, it is starting
> to hinder these drivers to develop swiftly.
>
> Also, all AVR32 AP7 SoC processors are end of lifed from Atmel (now
> Microchip).
>
> Finally, the GCC toolchain is stuck at version 4.2.x, and has not received
> any patches since the last release from Atmel;
> 4.2.4-atmel.1.1.3.avr32linux.1. When building kernel v4.10, this toolchain is
> no longer able to properly link the network stack.

For the record Buildroot distribution removed support back to 2015 IIRC.

commit 80be8753d5bacc865ceeee26c55bf4b0c2940e10
Author: Yann E. MORIN <yann.morin.1998@free.fr>
Date:   Sat Feb 14 10:23:15 2015 +0100

   arch/avr32: decommission for real

OTOH U-Boot still has it, but I didn't check if it even compiles.

> Haavard and I have came to the conclusion that we feel keeping AVR32 on life
> support offers more obstacles for Atmel ARMs, than it gives joy to AVR32
> users. I also suspect there are very few AVR32 users left today, if anybody
> at all.
>
> I have prepared three patches in my for-linus branch in git tree
> https://git.kernel.org/cgit/linux/kernel/git/egtvedt/linux-avr32.git
>
> Shortlog below, patches not inlined as they are quite large IMHO.
>
> I will send a formal pull request to Linus unless anybody objects loudly.
>
> I have also prepare patches for removing AVR32 specific kernel drivers, I
> will send those to the relevant subsystem maintainers.
>

Eager to give my
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
since it's a real burden and ugliness in drivers/dma/dw/core.c due to AVR32.

> Hans-Christian Noren Egtvedt (3):
>       avr32: remove support for AVR32 architecture
>       docs: remove all references to AVR32 architecture
>       scripts: remove AVR32 support from checkstack.pl
>
>  CREDITS                                            |    8 +
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>  arch/avr32/kernel/cpu.c                            |  410 ----
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>  arch/avr32/kernel/ocd.c                            |  167 --
>  arch/avr32/kernel/process.c                        |  355 ---
>  arch/avr32/kernel/ptrace.c                         |  356 ---
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>  delete mode 100644 arch/avr32/mach-at32ap/include/mach/smc.h
>  delete mode 100644 arch/avr32/mach-at32ap/include/mach/sram.h
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>  delete mode 100644 arch/avr32/mach-at32ap/pio.h
>  delete mode 100644 arch/avr32/mach-at32ap/pm-at32ap700x.S
>  delete mode 100644 arch/avr32/mach-at32ap/pm.c
>  delete mode 100644 arch/avr32/mach-at32ap/pm.h
>  delete mode 100644 arch/avr32/mach-at32ap/sdramc.h
>  delete mode 100644 arch/avr32/mm/Makefile
>  delete mode 100644 arch/avr32/mm/cache.c
>  delete mode 100644 arch/avr32/mm/clear_page.S
>  delete mode 100644 arch/avr32/mm/copy_page.S
>  delete mode 100644 arch/avr32/mm/dma-coherent.c
>  delete mode 100644 arch/avr32/mm/fault.c
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>  delete mode 100644 arch/avr32/oprofile/backtrace.c
>  delete mode 100644 arch/avr32/oprofile/op_model_avr32.c
>
> --
> Best regards,
> Hans-Christian Noren Egtvedt



-- 
With Best Regards,
Andy Shevchenko

[toc] | [prev] | [next] | [standalone]


#1590754

FromBoris Brezillon <boris.brezillon@free-electrons.com>
Date2017-03-02 02:10 +0100
Message-ID<tgnpM-30D-7@gated-at.bofh.it>
In reply to#1590630
On Wed, 1 Mar 2017 21:44:26 +0100
Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> wrote:

> Hello all,
> 
> The AVR32 architecture is not keeping up with the development of the kernel,
> and since it shares so much of the drivers with Atmel ARM SoC, it is starting
> to hinder these drivers to develop swiftly.

Thanks a lot for doing that.

> 
> Also, all AVR32 AP7 SoC processors are end of lifed from Atmel (now
> Microchip).
> 
> Finally, the GCC toolchain is stuck at version 4.2.x, and has not received
> any patches since the last release from Atmel;
> 4.2.4-atmel.1.1.3.avr32linux.1. When building kernel v4.10, this toolchain is
> no longer able to properly link the network stack.
> 
> Haavard and I have came to the conclusion that we feel keeping AVR32 on life
> support offers more obstacles for Atmel ARMs, than it gives joy to AVR32
> users. I also suspect there are very few AVR32 users left today, if anybody
> at all.
> 
> I have prepared three patches in my for-linus branch in git tree
> https://git.kernel.org/cgit/linux/kernel/git/egtvedt/linux-avr32.git

Not sure it has any value since I'm not the maintainer of this platform,
but

Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

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#1591244

FromNicolas Ferre <nicolas.ferre@microchip.com>
Date2017-03-02 17:10 +0100
Message-ID<tgBsK-4MC-39@gated-at.bofh.it>
In reply to#1590630
Le 01/03/2017 à 21:44, Hans-Christian Noren Egtvedt a écrit :
> Hello all,
> 
> The AVR32 architecture is not keeping up with the development of the kernel,
> and since it shares so much of the drivers with Atmel ARM SoC, it is starting
> to hinder these drivers to develop swiftly.

It will definitively help to remove some of the non-DT code in all our
former-common drivers.

> Also, all AVR32 AP7 SoC processors are end of lifed from Atmel (now
> Microchip).
> 
> Finally, the GCC toolchain is stuck at version 4.2.x, and has not received
> any patches since the last release from Atmel;
> 4.2.4-atmel.1.1.3.avr32linux.1. When building kernel v4.10, this toolchain is
> no longer able to properly link the network stack.
> 
> Haavard and I have came to the conclusion that we feel keeping AVR32 on life
> support offers more obstacles for Atmel ARMs, than it gives joy to AVR32
> users. I also suspect there are very few AVR32 users left today, if anybody
> at all.
> 
> I have prepared three patches in my for-linus branch in git tree
> https://git.kernel.org/cgit/linux/kernel/git/egtvedt/linux-avr32.git

Quick look at the patches (file path mostly) seems okay:

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>

And thanks a lot to Haavard and you Hans-Christian for having developed,
more than 10 years ago, and then maintained some of the nice early
drivers that we are still using for our ARM-based platforms!

> Shortlog below, patches not inlined as they are quite large IMHO.
> 
> I will send a formal pull request to Linus unless anybody objects loudly.
> 
> I have also prepare patches for removing AVR32 specific kernel drivers, I
> will send those to the relevant subsystem maintainers.
> 
> Hans-Christian Noren Egtvedt (3):
>       avr32: remove support for AVR32 architecture
>       docs: remove all references to AVR32 architecture
>       scripts: remove AVR32 support from checkstack.pl

Best regards,
-- 
Nicolas Ferre

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#1592948

FromHåvard Skinnemoen <hskinnemoen@gmail.com>
Date2017-03-06 07:10 +0100
Message-ID<thU0i-3Ey-7@gated-at.bofh.it>
In reply to#1590630
On Wed, Mar 1, 2017 at 12:44 PM, Hans-Christian Noren Egtvedt
<egtvedt@samfundet.no> wrote:
> I have prepared three patches in my for-linus branch in git tree
> https://git.kernel.org/cgit/linux/kernel/git/egtvedt/linux-avr32.git

Acked-by: Haavard Skinnemoen <hskinnemoen@gmail.com>

Thank you for keeping it alive for so long!

I looked through you tree superficially. There are a few references to
AVR32 remaining. Most of them are for other subsystems, but you could
consider picking up a couple of more for your patchset:

include/uapi/linux/elf-em.h still defines EM_AVR32. This could be
considered a part of the architecture code.

lib/Kconfig.debug has a list of architectures which want frame
pointers. You could probably remove AVR32 from that list.

mm/Kconfig has a special case for AVR32 needing two quicklists.

If you were planning to patch each of those separately later, please
ignore my comments.

Håvard

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#1593679

FromHans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Date2017-03-06 21:00 +0100
Message-ID<ti6Xw-4vE-15@gated-at.bofh.it>
In reply to#1592948
Around Sun 05 Mar 2017 21:58:16 -0800 or thereabout, Håvard Skinnemoen wrote:
> On Wed, Mar 1, 2017 at 12:44 PM, Hans-Christian Noren Egtvedt
> <egtvedt@samfundet.no> wrote:
>> I have prepared three patches in my for-linus branch in git tree
>> https://git.kernel.org/cgit/linux/kernel/git/egtvedt/linux-avr32.git
> 
> Acked-by: Haavard Skinnemoen <hskinnemoen@gmail.com>
> 
> Thank you for keeping it alive for so long!
> 
> I looked through you tree superficially. There are a few references to
> AVR32 remaining. Most of them are for other subsystems, but you could
> consider picking up a couple of more for your patchset:
> 
> include/uapi/linux/elf-em.h still defines EM_AVR32. This could be
> considered a part of the architecture code.

My git grep magic did not catch this.

> lib/Kconfig.debug has a list of architectures which want frame
> pointers. You could probably remove AVR32 from that list.

Same.

Will add a patch for these two.

> mm/Kconfig has a special case for AVR32 needing two quicklists.
>

This one I have in a different series, the one I planned to push to various
maintainers after the initial removal.

> If you were planning to patch each of those separately later, please
> ignore my comments.

Partly (-:

-- 
mvh
Hans-Christian Noren Egtvedt

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