Toolchain for ARM no-MMU OABI with FLAT binaries system.

Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Piotr Grudzinski]

Dear All,

I would like to have newer toolchain for an old ARM OABI system
running uClinux-dist
with FLAT binaries.
CPU is based on ARMv4 instruction set. There is MMU but was selected
not to be used.

Is there any suggested/known-to-work combination of GCC, uClibc,
binutils to use with
uClinux OABI system?

Best Regards,
Piotr

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Martin Guy]

> I would like to have newer toolchain for an old ARM OABI system
> running uClinux-dist
> with FLAT binaries.

Why? OABI is 11 times slower at FP thaem eabi, even without an FOU

> CPU is based on ARMv4 instruction set

Pefect for Debian

> Is there any suggested/known-to-work combination of GCC, uClibc,
> binutils to use with
> uClinux OABI system?

It depends which specific SoC you are compiling for

    M

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Bob Dunlop]

On Wed, Feb 08 at 01:17, Martin Guy wrote:
> > I would like to have newer toolchain for an old ARM OABI system
> > running uClinux-dist
> > with FLAT binaries.
> 
> Why? OABI is 11 times slower at FP thaem eabi, even without an FOU
> 
> > CPU is based on ARMv4 instruction set
> 
> Pefect for Debian

ARMv4 or ARMv4t ?  

EABI implies Thumb interworking so doesn't work on ARM4.

I know various people have proposed patches including the Debian crew but
I've yet to get EABI running on my old Balloon boards.  While it's now of
academic interest only, we've frozen that product, does anyone know of a
tool chain combo for EABI on ARMv4 without Thumb ?

-- 
        Bob Dunlop

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Piotr Borys]

2012/2/8 Bob Dunlop <bob.dunlop@xyzzy.org.uk>
> I know various people have proposed patches including the Debian crew but
> I've yet to get EABI running on my old Balloon boards.  While it's now of
> academic interest only, we've frozen that product, does anyone know of a
> tool chain combo for EABI on ARMv4 without Thumb ?

Never saw it - however the last time I was searching for it it was
like 4 years ago. For armv4t - no problem :)  You see - I really doubt
you can run linux without MMU unit.

cheers
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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Khem Raj]

On Wed, Feb 8, 2012 at 1:35 AM, Bob Dunlop <bob.dunlop@xyzzy.org.uk> wrote:
> I know various people have proposed patches including the Debian crew but
> I've yet to get EABI running on my old Balloon boards.  While it's now of
> academic interest only, we've frozen that product, does anyone know of a
> tool chain combo for EABI on ARMv4 without Thumb ?

OpenEmbedded has machines based on armv4 e.g. strongarm
and uses EABI and it does work.

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Mike Frysinger]

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On Wednesday 08 February 2012 08:24:06 Khem Raj wrote:
> On Wed, Feb 8, 2012 at 1:35 AM, Bob Dunlop <bob.dunlop@xyzzy.org.uk> wrote:
> > I know various people have proposed patches including the Debian crew but
> > I've yet to get EABI running on my old Balloon boards.  While it's now of
> > academic interest only, we've frozen that product, does anyone know of a
> > tool chain combo for EABI on ARMv4 without Thumb ?
> 
> OpenEmbedded has machines based on armv4 e.g. strongarm
> and uses EABI and it does work.

there is a linker flag or two to disable interworking so EABI should work on 
armv4 (which makes my NetWinder happy).

armv3 and older obviously won't work with EABI, but it sounds like support for 
that is being dropped from gcc/etc...
-mike

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Piotr Grudzinski]

Why OABI?
Because this is how it started several years ago and there are many
devices deployed.

The processor core seems to be Faraday's FA526 which is based on ARMv4
instruction set.

Having EABI would be easier but OABI is the reality.


Regards,
Piotr

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Khem Raj]

On Wed, Feb 8, 2012 at 6:30 AM, Piotr Grudzinski <piotr@powersmiths.com> wrote:
>
> Having EABI would be easier but OABI is the reality.

then stick to the versions of toolchain components where OABI is not bit rotten

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Piotr Grudzinski]

>
> then stick to the versions of toolchain components where OABI is not bit rotten
>

The old toolchain is based on GCC 3.4.6 and I had some cases were the
generated code was defective.

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Re: Toolchain for ARM no-MMU OABI with FLAT binaries system.

[Steve Bennett]

On 09/02/2012, at 4:37 AM, Piotr Grudzinski wrote:

>> 
>> then stick to the versions of toolchain components where OABI is not bit rotten
>> 
> 
> The old toolchain is based on GCC 3.4.6 and I had some cases were the
> generated code was defective.

I use a gcc 4.2.4 toolchain perfectly successfully with ARM OABI.

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