New MACH Addition

New MACH Addition

[Marko Milutinovic]

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Hello,

I recently ported barebox to a platform using an old AT91 chip (at91m55800a,
ARM7TDMI core). There is already a MACH_AT91 folder but this chip is
sufficiently different that I just made a new folder MACH_AT91_legacy. This
was just a test project for me to get familiar with using barebox.

I'm just wondering if there is any value in me merging in the code for this?
I realize it's a pretty old chipset, but I'm finding barebox very useful and
would like to contribute to it.

Thanks,
Marko

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Re: New MACH Addition

[Sascha Hauer]

Hi Marko,

On Mon, Apr 18, 2011 at 12:17:47PM -0600, Marko Milutinovic wrote:
> Hello,
> 
> I recently ported barebox to a platform using an old AT91 chip (at91m55800a,
> ARM7TDMI core). There is already a MACH_AT91 folder but this chip is
> sufficiently different that I just made a new folder MACH_AT91_legacy. This
> was just a test project for me to get familiar with using barebox.
> 
> I'm just wondering if there is any value in me merging in the code for this?
> I realize it's a pretty old chipset, but I'm finding barebox very useful and
> would like to contribute to it.

I never even heard of this chip. I think adding support for it should be
ok, but we might remove it in the future should non trivial architecture
changes become necessary and nobody cares for updating this.

Sascha


-- 
Pengutronix e.K.                           |                             |
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Re: New MACH Addition

[Robert Schwebel]

Hi Sascha,

On Mon, Apr 18, 2011 at 08:33:13PM +0200, Sascha Hauer wrote:
> On Mon, Apr 18, 2011 at 12:17:47PM -0600, Marko Milutinovic wrote:
> > I recently ported barebox to a platform using an old AT91 chip
> > (at91m55800a, ARM7TDMI core). There is already a MACH_AT91 folder
> > but this chip is sufficiently different that I just made a new
> > folder MACH_AT91_legacy. This was just a test project for me to get
> > familiar with using barebox.
> >
> > I'm just wondering if there is any value in me merging in the code
> > for this? I realize it's a pretty old chipset, but I'm finding
> > barebox very useful and would like to contribute to it.
>
> I never even heard of this chip. I think adding support for it should
> be ok, but we might remove it in the future should non trivial
> architecture changes become necessary and nobody cares for updating
> this.

We should somewhere have a board with this chip in the archive:
http://www.phytec.de/de/produkte/module-im-ueberblick/phycore/produktdetails/p/phycore-at91m55800a.html

Marko, are you working with a recent mainline kernel on this cpu? I'm
wondering about the mmu-less state of the kernel. Havn't tried for some
time.

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: New MACH Addition

[Marko Milutinovic]

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Hello,

By kernel do you mean the Linux kernel? I'm just starting work on that, so
not quite sure how that's going to go.

If you mean barebox then yes. I'm using fairly new code, I had to make some
modifications to bypass dealing with cache and MMU as this chip does not
have support for it. The changes were minor.

I will go through my revisions and make sure it conforms to how everything
else is done in this project and see about merging it in.

Thanks,
Marko

On Mon, Apr 18, 2011 at 12:38 PM, Robert Schwebel <r.schwebel@pengutronix.de
> wrote:

> Hi Sascha,
>
> On Mon, Apr 18, 2011 at 08:33:13PM +0200, Sascha Hauer wrote:
> > On Mon, Apr 18, 2011 at 12:17:47PM -0600, Marko Milutinovic wrote:
> > > I recently ported barebox to a platform using an old AT91 chip
> > > (at91m55800a, ARM7TDMI core). There is already a MACH_AT91 folder
> > > but this chip is sufficiently different that I just made a new
> > > folder MACH_AT91_legacy. This was just a test project for me to get
> > > familiar with using barebox.
> > >
> > > I'm just wondering if there is any value in me merging in the code
> > > for this? I realize it's a pretty old chipset, but I'm finding
> > > barebox very useful and would like to contribute to it.
> >
> > I never even heard of this chip. I think adding support for it should
> > be ok, but we might remove it in the future should non trivial
> > architecture changes become necessary and nobody cares for updating
> > this.
>
> We should somewhere have a board with this chip in the archive:
>
> http://www.phytec.de/de/produkte/module-im-ueberblick/phycore/produktdetails/p/phycore-at91m55800a.html
>
> Marko, are you working with a recent mainline kernel on this cpu? I'm
> wondering about the mmu-less state of the kernel. Havn't tried for some
> time.
>
> rsc
> --
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
>

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Re: New MACH Addition

[Robert Schwebel]

On Mon, Apr 18, 2011 at 03:04:52PM -0600, Marko Milutinovic wrote:
> By kernel do you mean the Linux kernel? I'm just starting work on
> that, so not quite sure how that's going to go.

Yes. I assume this would be a good starting point:
http://www.linux-arm.org/LinuxKernel/LinuxM3

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: New MACH Addition

[Jean-Christophe PLAGNIOL-VILLARD]

On 12:17 Mon 18 Apr     , Marko Milutinovic wrote:
>    Hello,
>    I recently ported barebox to a platform using an old AT91 chip
>    (at91m55800a, ARM7TDMI core). There is already a MACH_AT91 folder but this
>    chip is sufficiently different that I just made a new folder
>    MACH_AT91_legacy. This was just a test project for me to get familiar with
>    using barebox.A 
wow really old

I do not even known if I've a board somewhere

new MACH non please you need to integrate in the at91
as we also support at91x40 also

Best Regards,
J.

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